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 Grade. Sentence 1: I got a really bad grade in math. Sentence 2: I was afraid to tell my parents. Sentence 3: My parents got a phone call from my teacher. Sentence 4: They confronted me about my bad grade. Choices: a. Thankfully, he didn't mess up this time and passed with no issues. b. Fortunately, they were able to help me study and raise the grade.
a