对孕妇进行访视，询问并记录她们在怀孕期间的吸烟情况，而后研究吸烟史与婴儿低出生体重的联系，这种研究类型是（）。

A.现况研究

B.临床研究

C.病例对照研究

D.队列研究

E.实验研究

Steven Brockman, CFA, is a sell-side analyst. Approximately half of Brockman’s compensation comes form his firm’s investment-banking division. Brockman is asked to write a report about Anacortes Concrete (AC) , an investment-banking client. Despite his concerns about a slowdown in concrete demand, Brockman issues a very positive report on AC. When issuing his report, Brockman least likely violates the CFA Institute Standard relating to:（）

A. loyalty to employer.

B. disclosure of conflicts.

C. loyalty, prudence, and care.