求助，谁能解释一下？蓝皮书上的一道

何小媛159753

Stable interest rates on long-term bonds are the financial  market's vote of confidence in the Federal Reserve keeping in control of inflation.

A. in the Federal Reserve keeping in control  of  inflation
B. that the Federal Reserve  will keep inflation under control
C. for the Federal Reserve , that it would keep control of inflation
D. that inflation will be kept control of by the Federal Reserve
E. the inflation would be kept control of by the Federal Reserve

答案是C ，为什么能？