这个financial interest怎么定义？

问题如下：

David Lee, CFA, a fund manager at a financial company, conducts extensive analysis before purchasing shares of Innovative Tech Solutions (ITS) for all appropriate client portfolios. Subsequently, he acquires ITS stock for his sister's paid account, where Lee has a financial interest. After a downturn in ITS's market value a month later, leading to notable losses for all clients, are Lee's actions in line with the ethical Standards?

选项：

A.Yes B.No, Lee's actions violate the Standard on transaction priority C.No, Lee's actions breach the Standard on diligence and reasonable basis

解释：

Option B is correct. According to Standard VI(B), Priority of Transactions, family accounts that are also client accounts must be treated like any regular client account, without any preferential treatment or disadvantage due to familial ties. If an investment professional has a beneficial interest in such an account, they may need to adhere to additional preclearance or reporting norms set by their employer or law. Therefore, Lee's management of his sister's account, akin to other client accounts, should not have been disadvantaged, indicating a violation of the Standard on transaction priority. Option C is incorrect as Lee's thorough research before investing in ITS stock aligns with the Standard on diligence and reasonable basis.