The activity described in the question raises several red flags for money laundering, such as large and frequent cash deposits, transfers to offshore jurisdictions, and involvement of a charitable organization that could be a front for illicit funds. The Compliance Officer should file a suspicious transaction report (STR) with the competent authority, such as the Financial Intelligence Unit (FIU), as soon as possible, and provide all the relevant information and documentation to support the suspicion. Filing an STR is a legal obligation for financial institutions and does not require the consent or notification of the customer. The Compliance Officer should also follow the bank's internal policies and procedures for handling such cases, which may include freezing the account, conducting further investigation, or escalating the matter to senior management.
References:
ACAMS CAMS Certification Study Guide1, Chapter 4: Conducting or Supporting the Investigation, Section 4.4: Reporting, pp. 137-139 ACAMS CAMS Certification Video Training Course2, Module 4: Conducting or Supporting the Investigation, Lesson 4.4: Reporting ACAMS CAMS Certification Exam Outline3, Domain 4: Conducting or Supporting the Investigation, Task 4.4: File internal and external reports, p. 18

A beneficial owner is the natural person who ultimately owns or controls a legal entity or arrangement, such as a company, a trust, or a foundation. Identifying the beneficial owner is essential for preventing and detecting money laundering, terrorist financing, tax evasion, and other illicit activities that may involve the misuse of corporate vehicles. However, some individuals or entities may attempt to conceal the true beneficial ownership of a company by using various techniques, such as complex ownership structures, shell companies, bearer shares, or nominees. A nominee is a person or an entity that acts on behalf of another person or entity, usually for a fee or a commission, without disclosing the identity of the real owner or controller. Nominees can be used to protect or conceal the identity of the beneficial owner and controller of a company or asset. A nominee can help overcome jurisdictional controls on company ownership and circumvent directorship bans imposed by courts and government authorities. While the appointment of nominees is lawful in most countries, the use of nominees for money laundering purposes is illegal and a red flag for suspicious activity. Therefore, the person filling out an application on the company's behalf indicating that a beneficial owner is a nominee for another person not named in the company's documentation is an indicator that there is an attempt to conceal the company's true beneficial ownership12.
The other options are not necessarily indicators of concealment of beneficial ownership, as they may have legitimate explanations or reasons. The company having a subsidiary in another jurisdiction with a local investor as a beneficial owner may be a normal business practice or a strategic decision, as long as the ownership information is transparent and accurate. Recent changes to the company's ownership structure may reflect the company's growth, development, or adaptation to market conditions, as long as they are documented and reported to the relevant authorities. Beneficial ownership information from the time that the company was formed several years ago not matching the current information may be due to natural changes in the company's shareholders, directors, or managers, as long as they are updated and verified periodically.
References:
Concealment of Beneficial Ownership - Financial Action Task Force
What's a Beneficial Owner and Why Does it Matter? - Dun & Bradstreet
[ACAMS Study Guide, 6th Edition, Chapter 6, pp. 171-172]

According to the ACAMS CAMS Study Guide (the 6th edition), FIUs are central agencies that receive, analyze, and disseminate financial intelligence to support the detection and prevention of money laundering, terrorist financing, and other financial crimes1. FIUs have different legal powers and functions depending on their type and jurisdiction, but generally they can use various investigative techniques, such as requesting additional information from reporting entities, accessing databases, conducting analysis, and issuing guidance12. FIUs also have access to a wide range of financial information, such as suspicious activity reports, currency transaction reports, cross-border cash declarations, and other relevant data sources, to identify and assess potential illicit activities13. Moreover, FIUs can cooperate and exchange information with domestic and foreign counterparts, subject to certain legal and operational safeguards, to facilitate cross-border investigations and prosecutions of financial crimes14.
References:
ACAMS CAMS Study Guide (the 6th edition), Chapter 5: The Role of the Financial Intelligence Unit in Combating Money Laundering and Terrorist Financing, pages 153-1631 What are Financial Intelligence Units (FIUs)? | Dow Jones Financial Intelligence Units - Committee of Experts on the Evaluation of Anti-Money Laundering Measures and the Financing of Terrorism - MONEYVAL - Coe The role of financial intelligence units in combating money laundering (Chapter 6) - Money Laundering

Cash couriers are individuals who physically transport cash or other monetary instruments across borders or within a country, often to avoid detection by authorities or reporting obligations. Cash couriers are a common method used by terrorist financiers to move funds without leaving an audit trail, as cash is anonymous, portable, and widely accepted12.
References:
1: ACAMS CAMS Certification Video Training Course, Module 4: Terrorist Financing, Section 4.2: Methods of Terrorist Financing, Slide 9 2: ACAMS CAMS Certification Study Guide, 6th Edition, Chapter 4: Terrorist Financing, Page 97 Reference: https://www.fatf-gafi.org/media/fatf/documents/reports/FATF%20Terrorist%20Financing%
20Typologies%20Report.pdf (24)