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: Sure Shot. Sentence 1: Tyrone was an excellent marksman. Sentence 2: He knew he could win a prize at the shooting gallery at the carnival. Sentence 3: When he failed to hit any of the targets, he knew the game was rigged. Sentence 4: Tyrone demanded that his money be refunded, but the carnie refused. Choices: a. Xavier limped to the bench and sat down, fed up. b. Tyrone shot at the carnie, and he didn't miss.
a