下列食物链正确的是                                                                               

A．草→ 蚱蜢→食虫鸟→蛇→鹰

B．蚱蜢→草→食草子的鸟→鹰→狐

C．阳光→草→蚱蜢→食虫鸟→蛇→鹰

D．草←蚱蜢←食虫鸟←鹰←蛇