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: Tom wanted to break out of his shell. Sentence 2: He felt that he always played it safe. Sentence 3: He set up a bungee jumping appointment. Sentence 4: When the day came Tom cancelled it. Sentence 5: He felt disappointed in himself for chickening out. Choices: a. Diet and Exercise. b. Bungee Jumping.

b