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: Upset grade. Sentence 1: Kelly got her paper back. Sentence 2: She was expecting to get a top grade. Sentence 3: But she nearly failed. Sentence 4: She looked over at her friend who got a perfect grade. Choices: a. Kelly was furious at her. b. It was amazing to see such a rare creature.
b