(A) enabling it to withhold from the public
(B) for it to withhold from the public
(C) for withholding disclosure to the public of
(D) that enable them to withhold from public disclosure
(E) that they can withhold public disclosure of
Solution:
Pronoun and Parallelism
D and E can be eliminated for the use of them and they for Central Intelligence Agency.
B is awkward in the use of for it to withhold from public
C is wordy and awkward in the use of for withholding disclosure to the public of.
A conserves the cause-effect relationship through the apt use of ing form in enabling and is concise and logically correct.
Hence, A is the best choice.
Other possible doubt- why it cannot refer to the Supreme Court.
Supreme Court is the subject or active part here and the CIA is the object or passive part here. Enabling would obviously/logically refer to the object and hence, it cannot refer to the Supreme Court.
OG Solution:
Choice A is best: enabling ... clearly modifies powers, it refers logically and grammatically to the Central Intelligence Agency, and to withhold from the public is concisely and idiomatically phrased. In choices B and C, the preposition for is used unidiomatically in place of the "-ing" modifier to introduce the phrase describing powers. In choices C, D, and E, withholding)... disclosure is wordy and imprecise, since it is really the identities that are to be withheld. The plural pronouns them in D and they in E do not agree with the singular Agency, and that in E mistakenly introduces a new independent clause rather than a modifying phrase for powers.
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