Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: Bill noticed small items were disappearing from his room. Sentence 2: He wondered if one of his roommates might be to blame. Sentence 3: He bought a spy camera and set it up next to some loose cash. Sentence 4: Later, the playback showed Bill's roommate Kyle come into Bill's room. Sentence 5: Kyle pocketed the cash and Bill smiled because the mystery was solved. Choices: a. The Grandfather Clock. b. To Catch a Crook.

b