[求助]语法题

5or6

5.    A peculiar feature of the embryonic mammalian circulatory system is that in the area of the heart the cells adhere to one another, beating in unison and adopting specialized orientations exclusive of one another.
(A) beating in unison and adopting
(B) they beat in unison while adopting
(C) beat in unison, and adopt
(D) beating in unison yet adopting
(E) even though they beat in unison and adopt
为什么c不对呢？

dreadpower

如果选C，就是认为beat和adopt和adhere to 平行，表示平行关系

     但是原句表示的是动作之间的伴随关系（分词）