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: Class. Sentence 1: The man missed some class. Sentence 2: There was a pop quiz one day. Sentence 3: He had not prepared for the test. Sentence 4: He did very poorly on the test. Choices: a. She learned the piano over the course of a few weeks and enjoyed it! b. He failed the class.
A: 
a