肱骨外科颈骨折是（）。

A.肱骨大、小结节交界处

B.肱骨大、小结节移行为肱骨干的交界处

C.肱骨头周围的环形沟

D.肱骨头与肱骨干的交界处

E.肱骨上端干骺端处

Ralph Salley, CFA, is a portfolio manager at a mutual fund company. According to the Standards of Professional Conduct relating to diligence and reasonable basis, which of the following statements is most accurate（）

A. CFA members may not rely solely on third-party research to make investment decisions.

B. CFA members may rely on others in their firm to determine whether thirdparty research has a sound basis and continuous reliability.

C. CFA members may not rely on others in their firm to determine whether third-party research has a sound basis and continuously reliability.