Unknown 请教一道题

when goshawk chicks are young,____parents share in the hunting duties and in guarding the nest.

A,the both      B,both       C,both of       D,and both..

对both和both of 拿不定主义。。于是翻字典。有如下两个例句

both (the) windows are not open...

both(of them) are doctors.

谢谢先哦。。各位牛牛！！

还是觉得是 B

加个限定词用C比较合适 both of its parents