B. gulliver expects the humans in the land of the houyhnhnms to be very wise, but they are the most brutal and disgusting beasts imaginable.
Explanation:
The term irony itself refers to an event that is the opposite to what one expects. A situational irony in literature occurs when what happens is the contrary to what the characters or the audience are expecting to happen. If we think of Gulliver's Travels, we can see a situational irony when gulliver expects the humans in the land of the houyhnhnms to be very wise, but they are the most brutal and disgusting beasts imaginable. What occurs is the contrary to what the character and the audience expect.