Though research remains to be done into the reasons why the

[BTGmoderatorDC]

Though research remains to be done into the reasons why the Civil War was triggered, scholars do not regard slavery to be the sole cause.

(A) Though research remains to be done into the reasons why the Civil War was triggered, scholars do not regard slavery to be the sole cause.

(B) Though research remains to be done into what triggered the Civil War, scholars do not regard slavery as the sole cause.

(C) Though the reasons that triggered the Civil War remain to be researched, slavery is not regarded by scholars to be the sole cause.

(D) Despite research remaining into the reasons why the Civil War was triggered, scholars do not regard slavery as the sole cause.

(E) Scholars do not regard slavery as the sole cause of the Civil War, though the reasons for it being triggered remain to be researched.

OA B

Source: Manhattan Prep

[deloitte247]

"Regarded to be" is incorrect and the reasons why/reasons being '" is also incorrect.

OPTION A:- INCORRECT
This choice is incorrect as it repeats the original sentence........Do not regard safety to be the sole cause. Just repetition of an incorrect clause.

OPTION B:- CORRECT
This choice uses the concise phrase "what triggered the civil war" and uses the Idiomatic phrase "regard slavery as the sole cause " (regard X and Y).

OPTION C:- INCORRECT
This choice incorrectly uses the unidiomatic "slavery is not regarded ...to be the sole cause".
Also, the main clause has been written in the passive voice unnecessarily. regarded scholars to be the main cause.

OPTION D:- INCORRECT
This choice contains the redundancy *reason why*and the awkward phrasing "despite research remaining."

OPTION E:- INCORRECT
This choice incorrectly introduces an ambiguous pronoun (it) that could refer either to slavery or to the civil war.
The reasons for it being triggered remain to be researched.