单项选择题

设f(0)=0,存在,则=(    )
   A.f'(0)    B.f'(x)    C.f(0)   D.

A.174.24.96:6088/Latex/latex.action?latex=XGxpbV97eOKGkjB9XGZyYWN7Zih4KX17eH0%3D'
B.174.24.96:6088/Latex/latex.action?latex=XGxpbV97eOKGkjB9XGZyYWN7Zih4KX17eH0%3D'
C.f'(0)
D.f'(x)
E.f(0)
F.G.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17Mn1mJygwKQ%3D%3D'