单选题 Scan, CFA, is a portfolio manager for RBS Investment Management Company-a registered investment organization that advises investment companies and private accounts-was promoted to that position three years ago. Richard, his supervisor, is responsible for reviewing Sean's portfolio account transactions and his required monthly reports of personal stock transactions. Scan has been using Marcy, a broker, almost exclusively for portfolio account brokerage transactions. For securities in which Marcy's firm makes a market, Marcy has been giving Scan lower prices for personal purchases and higher for personal sales than Marcy gives to Sean's portfolio accounts and other investors. Sean has been filing monthly reports with Richard only for those months in which he has no personal transactions. Which of the following is least likely to be a violation of the Code and Standards?

• A. Scan failed to disclose to his employer his personal transactions.
• B. Richard failed enforce reasonable procedures for supervising and monitoring Sean's trading for his own account.
• C. Richard allowed Scan to use Marcy as his broker for personal trades.