Instructions: 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 seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.
Input: Title: Dave's Costume. Sentence 1: Suzanne had a Halloween party. Sentence 2: She asked all of her guests to come in costume. Sentence 3: She said that a prize would be given for the best costume. Sentence 4: A boy named Dave came dressed as a girl. Choices: a. His costume was so convincing he won first prize in the contest. b. With one yank she tore her hair free.
Output:
a