— _____ the boy _____ the second picture? 

— He's my cousin, Peter. [ ]

A. Who's, in

B. Who's, of

C. What's, on

D. What's, for

中央银行参与金融市场的目的不是筹措资金或获利，而是为了实现货币政策目标，调节经济和稳定物价。