In this exercise, the sentence is: "Si te hubieses marchado, se __________ tu desagrado por la difícil situación."
The correct completion for the sentence is "habría confirmado" because it matches the conditional structure used in the first part of the sentence. The sentence is expressing a hypothetical situation in the past, so the appropriate verb tense to use is the conditional tense, which is "habría confirmado."
Therefore, the correct answer from the options provided is:
b. habría confirmado
