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
Please explain the right answer
Eliminate B: Run on Sentence. IC, IC.
Eliminate E: Although syntax is right, IC, DC. It doenst have they "contrast" shown by D.
Eliminate C: make it a list of "features"....That is not what the author is trying to say.
Between A and D, i chose D. Although both are abosolute phrases describing how "cells" behave, AC D shows the constrast with D.