下列哪项心理沟通方式适用于护理婴儿（）

A.因势利导

B.多做游戏

C.搂抱与抚摸

D.适时鼓励

E.社会交流

Concerning efficient financial( including derivative) markets, the most appropriate description is that()

A. it is often possible to earn abnormal returns. 

B. the law of one price holds only in the academic literature. 

C. arbitrage opportunities rarely exist and are quickly eliminated.