My mother is against my suggestion while my father is__________ it.

A．in need of

B．in face of

C．in favor of

D．in place of

功率放大器的增益用dB表示指放大器的输入功率和输出功率之比的对数关系，电子管FC-732放大器的增益约为13dB，则它的输出功率是输入功率的（）倍。