单项选择题

A.174.24.96:6088/Latex/latex.action?latex=Zih4KT1cbGVmdFx7XGJlZ2lue2FycmF5fXtjfXheMix44omlMFxceCx477ycMCAgXGVuZHthcnJh%0D%0AeX0%3D'
B.f'(0)=0
C.f'(0)=1
D.f'(0)=2