单项选择题
设f(x)在(-∞，+∞)存在二阶导数，且f(x)=-f(-x)，当x＜0时有f’(x)＜0，f"(x)＞0，则当x＞0时有______。
A．f’(x)＜0，f"(x)＞0
B．f’(x)＞0，f"(x)＜0
C．f’(x)＞0，f"(x)＞0
D．f’(x)＜0，f"(x)＜0
B．f’(x)＞0，f"(x)＜0
C．f’(x)＞0，f"(x)＞0
D．f’(x)＜0，f"(x)＜0
