Given the task definition and input, reply with output. 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.

Title: Bad Habit. Sentence 1: Quinn wanted to break his bad habit of killing guests. Sentence 2: He invited a friend over with the plan of letting them leave alive. Sentence 3: Quinn tried very hard to keep his promise to himself. Sentence 4: His guest annoyed him too much, just like all the rest. Choices: a. Cindy rolled up her windows and put the AC on. b. As Quinn buried the body, he told himself he'd do better next time.
a