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: Chance. Sentence 1: Abigail was feeling lucky. Sentence 2: She decided to buy some lottery tickets. Sentence 3: She waited for the announcement. Sentence 4: The winner was announced. Choices: a. She didn't win the contest. b. She threatened to change them into toads and they stopped.
b