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: Samantha was on the cross country team at her school. Sentence 2: She really wanted to improve her mile time. Sentence 3: She ran everyday in the morning and at night. Sentence 4: She eventually had more stamina to run. Sentence 5: At the next meet, she was able to break her mile time. Choices: a. Samantha Runs The Mile. b. Head.

a