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: Rock collector. Sentence 1: Abe liked to collect rocks. Sentence 2: He found plenty near the lake next to his house. Sentence 3: But he was looking for a perfect white stone. Sentence 4: He looked everywhere and couldn't find it. Choices: a. When he stepped on a white rock by accident, he smiled. b. Bea had to swat it with a broom to get it back outside.
Output:
a