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: Bobby's Mess. Sentence 1: Bobby didn't like to help pick up his toys. Sentence 2: His mother walked into his room to save his clothes. Sentence 3: She tripped over a toy car. Sentence 4: Bobby's mother sprained her ankle. Choices: a. Bobby learned he needed to pick up his toys. b. He gave Steve the new book.
Output:
a