SajjadAhmad
Although most physicians agree that exercise is necessary for physical and mental well-being, they caution against doing too much too soon.
(A) they caution against doing too much too soon.
(B) doing too much too soon is cautioned against by them.
(C) but cautioning against doing too much too soon.
(D) yet caution against doing too much too soon.
(E) it is cautioned against to do too much too soon.
SajjadAhmad
(A) they caution against doing too much too soon.
This is the correct answer choice. It clearly and precisely communicates the intended meaning of the sentence. "They" correctly refers to the physicians
SajjadAhmad
(B) doing too much too soon is cautioned against by them.
Although no apparent major errors, this answer choice is in the passive voice. Choice A) clearly conveys the meaning better
SajjadAhmad
(C) but cautioning against doing too much too soon.
The first part of the sentence is a dependent clause (DC), which requires a independent clause (IC) attached. With the introduction of "but", this DC remains without a IC attached. Incorrect.
SajjadAhmad
(D) yet caution against doing too much too soon.
Same as C)
SajjadAhmad
(E) it is cautioned against to do too much too soon.
There's no clear antecedent for "it"