According to the Basel Committee on Banking Supervision's Customer Due Diligence for Banks, the compliance function should provide an evaluation of a bank's policies and procedures independent from its management. The compliance function is responsible for ensuring that the bank adheres to the relevant laws, regulations, and standards on customer due diligence, anti-money laundering, and combating the financing of terrorism. The compliance function should also monitor the implementation and effectiveness of the bank's customer due diligence policies and procedures, identify and report any breaches or deficiencies, and recommend corrective actions or improvements. The compliance function should have sufficient authority, independence, resources, and access to information to perform its duties effectively.
Customer due diligence for banks, Basel Committee on Banking Supervision, October 2001, paragraphs 55-56 CAMS Study Guide - 6th Edition, Chapter 6, page 172 CAMS Certification Exam Outline, Domain 3, Task 3.1, Skill 3.1.2 Anti-Money-Laundering Guidance: Basel Committee Consultative Paper ..., Office of the Comptroller of the Currency, February 2001, page 2

The Fourth European Union Directive on money laundering (AMLD4) requires member countries to maintain registries of the beneficial owners of legal entities, such as companies, trusts, foundations, etc. This is to ensure that the true identity and ownership of the customers and the natural persons on whose behalf transactions are conducted are known to the obliged entities, such as banks, lawyers, accountants, etc., and to the competent authorities, such as regulators, supervisors, or law enforcement12. This requirement aims to prevent the misuse of legal entities for money laundering or terrorist financing purposes, and to enhance transparency andaccess to beneficial ownership information34.
1: AMLD4, Article 30, 5; 2: AMLD4, Recital 25, 5; 3: AMLD4, Recital 26, 5; 4: AMLD4, Recital 27, 5.
Reference:https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32018L0843&from=EN

Financial institutions closely monitor customer accounts for suspicious activity related to money laundering, terrorist financing, or other illicit activities. If an account consistently triggers multiple suspicious activity reports (SARs), it raises red flags. These reports indicate unusual or potentially illegal transactions, such as large cash deposits, frequent transfers to high-risk jurisdictions, or patterns inconsistent with the customer's profile. To mitigate risk and comply with anti-money laundering (AML) regulations, the financial institution may decide to close the account. Regular SAR filings are essential for maintaining the integrity of the financial system and preventing illicit financial flows12.
References:
1. ACAMS: Suspicious Activity Reports (SARs)
2. MoneyLaundering.com: Suspicious Activity Reports

The Office of Foreign Assets Control (OFAC) is a department of the US Treasury that administers and enforces economic and trade sanctions imposed by the US against countries and groups of individuals, such as terrorists and narcotics traffickers. The sanctions can be either comprehensive or selective, using the blocking of assets and trade restrictions to accomplish foreign policy and national security goals. The main purpose of the US Treasury Department for OFAC's extraterritorial reach is to apply these sanctions to any person or entity that is subject to US jurisdiction, or that engages in transactions involving US persons, US dollars, or US goods or services. This way, the US can exert pressure on the targets of the sanctions and prevent them from accessing the US financial system or market. OFAC's extraterritorial reach is authorized by Congressional legislation or presidential emergency powers, and is often based on UN Security Council resolutions or multilateral agreements.
Office of Foreign Assets Control (OFAC): Definition, Sanctions
About OFAC | Office of Foreign Assets Control
OFAC's Extraterritorial Reach: Purpose of the US Treasury Department
Reference: https://www.natlawreview.com/article/aggressive-extraterritorial-reach-us-economic-sanctions- foreign-company-exposure-to

According to the CAMS Certification Package - 6th Edition1, a financial institution that processes a wire transfer is required to file a suspicious transaction report (STR) in thejurisdiction where it is located, if it detects any red flags or indicators of money laundering, terrorism financing, or other financial crimes. The financial institution does not need to file an STR in the jurisdictions of the originator or the beneficiary of the wire transfer, unless it has a branch or a subsidiary there. Therefore, the correct answer is A. The transaction in Country A.
CAMS Certification Package - 6th Edition1, Chapter 4: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), Section: Wire Transfers, pp. 161-162.