This information can be found in the Certified Anti-Money Laundering Specialist (CAMS) study guide, 6th edition, under the section on Unusual Customer Identification Scenarios. The guide explains that two indicators that should be included in awareness training for unusual customer identification scenarios are:
A: The customer opens the account in the name of a family member who begins making large deposits.
This is an indicator of potential structuring, where a customer may be attempting to avoid triggering reporting thresholds by depositing funds in smaller amounts over time. It is important for staff to be aware of this scenario and to monitor accounts for potential suspicious activity.
B: The customer's name and home address cannot be verified.
This is an indicator of potential identity theft or other fraudulent activity. If a customer's identifying information cannot be verified, it is important for staff to conduct additional due diligence to ensure that the customer is legitimate and that the account is not being used for illicit purposes.

The threat of US sanctions against foreign individuals and entities continues to exist despite the absence of a US nexus. This is stated in the Certified Anti-Money Laundering Specialist (the 6th edition) manual on page
591, which states: "It is important to note that the threat of US sanctions against foreign individuals and entities continues to exist even when there is no direct US nexus (i.e., no US persons or assets involved)."

Conducting anonymous transactions is the most likely activity to facilitate money laundering through online banking systems with inadequate controls. Anonymous transactions allow money launderers to hide their identity, source and destination of funds, and the purpose of their transactions from the authorities and the financial institutions. Online banking systems that do not have proper KYC, customer due diligence, and transaction monitoring controls are vulnerable to being exploited by money launderers who can use various techniques, such as encryption, proxy servers, virtual currencies, prepaid cards, and online gambling, to conduct anonymous transactions123.
ACAMS CAMS Certification Study Guide, 6th Edition, Chapter 2, page 40-41, 43-44 ACAMS CAMS Certification Video Training Course, Module 2, Lesson 2.4, Money Laundering Using New Payment Methods
1, Fighting money laundering in the age of online banking, virtual currencies and internet gambling | ERA Forum
2, Financial crime risk management in digital payments | McKinsey
3, The Relationship Between Digital Banking and Financial Crime

The Egmont Group is an international body of Financial Intelligence Units (FIUs) from around the world. Its primary purpose is to serve as a forum for FIUs to exchange information, and it also sets international standards for AML/CFT measures. Additionally, the Egmont Group does not serve as a prudential regulator for global financial institutions or as an authoritative body in the field of anti-corruption.

According to the Basel Committee on Banking Supervision (BCBS), a sound KYC program should contain four essential elements: (i) customer acceptance policy; (ii) customer identification; (iii) on-going monitoring of higher risk accounts; and (iv) risk management1. These elements correspond to the options B in the question, as customer identification involves verifying the identity and beneficial ownership of the customers, risk assessment involves determining the level of risk posed by the customers and their activities, customer screening involves checking the customers against relevant sanctions and watch lists, and monitoring involves reviewing the customers' transactions and behavior for any anomalies or red flags.
Consolidated KYC Risk Management - Bank for International Settlements
Reference: https://www.bis.org/publ/bcbs77.pdf