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 volunteered as a big brother. Sentence 2: There was one kid who was particularly bad. Sentence 3: Tom tried a lot of things to break through to him. Sentence 4: Nothing really panned out. Sentence 5: Tom had to give up eventually. Choices: a. Terrible twos. b. Lost Cause.

b