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: Tutor. Sentence 1: Jacob's grades were getting worse and worse as he got older. Sentence 2: His parents were very worried about him so they got him a tutor. Sentence 3: Jacob told me he hated the tutor but still tried to work with him. Sentence 4: One day Jacob said he thinks that the tutoring is working. Choices: a. Jacob's grades went up by one full letter grade on his next report! b. When his birthday came around Dustin's parents got him the TV!
b