OE
The word “but” acts as a signal to reverse course here, taking you in the opposite direction of the adjectives initially used to define documentary filmmakers: “dispassionate” and objective.” A good fill-in would be speak out.
Advertise (draw attention to publicly in order to promote sales), inveigle (win, or win over, by flattery), strain (make a strenuous effort), and aspirate (pronounce a sound in the exhalation of breath) have no relationship. Note that inveigle is not the same as inveigh (which does not appear as a choice but would have been a suitable correct answer, as it means “express angry disapproval”—the GRE sometimes plays on commonly confused words).
Answer: A,C