Here's the
official explanation provided by the GMAC for this question:
The sentence says that
Napoleon ordered that all paintings in the Louvre are given new frames in the fashionable empire style. The function of Napoleon’s order, like that of any order, was to prescribe a change, not to describe the way things actually are or will be. Expressing this clearly and effectively requires a subjunctive verb (ordered that
someone do something; ordered that something
be done) or an infinitive verb (ordered someone
to do something; ordered something
to be done). For this reason, the indicative verb forms used in the original version and in all the answer choices except B are inappropriate. The present and future tenses are also inappropriate because the sentence is entirely about past events.
Option A: The present indicative
are is the wrong verb form both because the sentence is entirely about past events and because Napoleon’s order aimed to bring about a change, not to describe a condition that was already in effect.
Option B: Correct. This correctly uses the subjunctive verb form in the phrase
ordered that all paintings …
be given new frames, indicating that when Napoleon gave the order, the action had not yet taken place and might not have taken place if the order had not been given or obeyed.
Option C: Are given is the wrong verb form. The phrase
in the fashion of the … style is essentially equivalent to
in the style of the …
style, so it is puzzlingly redundant.
Option D: Will be given is the wrong verb form. The phrase
in the fashion of the … style is essentially equivalent to
in the style of the …
style, so it is puzzlingly redundant.
Option E: Were given is the wrong verb form.
The correct answer is B.
Please note that I'm not the author of this explanation. I'm just posting it here since I believe it can help the community.