Sentence Correction

please explain the answer

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

A, C - Intention of the author is to show 'peculiar behaviour' of the cells. It means there has to be contrast in the sentence. Threfore we can cross these options out.
B - according to OG 11 while is generally used as a subordinate conjuction
D - modfiers at the end of the sentence are generally used to show the result or purpose of the information given in preceeding sentence but in this we want to show the reason for a peculiar behaviour.

I think it is E

Btw - what is OA

I think the ans is 'D' here.

Because this sentence says "The peculiar system", where yet is rightly used.

I choose C

beating and adopting is referring to cells
also, it should maintain parallelism with adhere
only C does this

what is OA?

Answer is 'D'. Please explain me how?

barron


i also thought that the answer was 'c' but unfortunately it was not the answer.

Well the answer has to be B or D as we have to show a contrast ...beating together but/yet/while adopting specialized orientation....

out of B or D, D offers paralleism, so D is the correct answer

Hope the above helps

answer is D

author wants to say that even thought the heart cells adhere to one other and beat in unison still they form exclusive orientations.

Author is not saying that the cells beat in unison and also form exclusive orientation.

Only B and D can be correct. There is a pronoun error in B hence D is the correct answer.