18. 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

Solution:

Modifiers*

There is a cause, effect relationship between the parts of sentence that are before and after the comma. Hence, the first underlined word should have ‘ing’ form.
Thus, B, C, and E can be eliminated.
“Yet adopting” is better than “and adopting” as per meaning of the sentence and hence, D is the best choice.

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