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: John wanted to do well in school. Sentence 2: He was struggling. Sentence 3: He hired a tutor. Sentence 4: The tutor helped him. Sentence 5: His grades improved. Choices: a. Homework. b. Knob.

a