In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.
Q: Title: Bird Cage. Sentence 1: The boy locked the cage. Sentence 2: He left for school. Sentence 3: He returned home. Sentence 4: The cage was unlocked. Choices: a. He caught his brother playing with his bird. b. She just prayed they had enough gas to make it.
A:
b