(A) tell individual genes both when to become active and when to remain
(B) tell individual genes both at which time they should become active or should remain
(C) tells individual genes both when to become active or remain
(D) tells individual genes both when to become active or when to remain
(E) will tell an individual gene both about when it should become active and remain
Solution:
Subject-verb Agreement + Parallelism
“Substance….tell” is the correct usage.
Hence, C and D can be eliminated.
E is wrong in the awkward use of ‘will’ that changes the meaning of the sentence.
B is wordy and awkward.
A uses the correct verb ‘tell’ and conserves the parallelism by the use of “that tell when to….and when to”
Hence, A is the best choice.
Sentence Correction - 1000 Questions with Solution:
