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: Study. Sentence 1: The boy studied. Sentence 2: He took the test. Sentence 3: He got a great grade on the test. Sentence 4: He showed the score to his mom. Choices: a. He thanked his mom for making him study. b. She felt bad afterwards but she enjoyed the food.
A: 
b