The correct answer is B, as a customer acceptance policy is an essential element of KYC standards according to the Basel Committee's Customer Due Diligence for Banks paper1. A customer acceptance policy defines the types of customers that the bank is willing to accept, and the conditions and limitations that apply to such relationships. A customer acceptance policy helps the bank to avoid customers who are likely to pose a higher than average risk of money laundering or terrorist financing, or who are not willing to provide sufficient information for identification and verification purposes1.
References: 1: Customer due diligence for banks - Bank for International Settlements, page 9.
Reference: https://www.bis.org/publ/bcbs77.pdf

Explanation
A country that does not have strong predicate offenses and is lax in prosecuting AML cases could suffer increased organized crime and corruption as a social/economic consequence. "Weaknesses in the AML/CFT regime can lead to a range of economic and social consequences, including...increased crime and corruption." (CAMS Manual, 6th Edition, page 32)

Explanation/Reference: https://www.wolfsberg-principles.com/sites/default/files/wb/pdfs/wolfsberg-standards/8.%
20Wolfsberg-Correspondent-Banking-Principles-2014.pdf

Explanation
The practice of brokerage firms maintaining securities as nominees and the speed of the transactions are two factors specific to the securities industry that increase the exposure to money laundering risk. Nominee accounts can be used to conceal beneficial ownership and obscure transaction trails. The speed of transactions can make it difficult to detect and prevent suspicious activity in real time.