Final answer:
In 'Gulliver's Travels,' the Houyhnhnms are a race of talking horses who have enslaved the humanlike beings known as Yahoos, which is the correct answer to the student's question (Option A).
Step-by-step explanation:
In Jonathan Swift's Gulliver's Travels, the race of talking horses is called Houyhnhnms, and they have enslaved humanlike beings known as Yahoos. The Houyhnhnms represent an ideal of rationality and civility, while the Yahoos embody all that is deplorable and savage in humans. Gulliver initially finds himself disgusted by the Yahoos and admires the Houyhnhnms, but as the narrative unfolds, the complexity of human nature and the critique of society become more evident.
The corrected choice from the provided options is A) Yahoos, which are depicted as filthy, vicious creatures that stand in contrast to the noble Houyhnhnms. This contrast serves as a satirical device to critique and reflect upon human behavior and societal norms of Swift's time. The other options, B) Lemuel Gullivers, C) Brobdingnagians, and D) Laputians, are characters and races from other parts of Swift's narrative.