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: Renee wanted to lose weight and get in better shape. Sentence 2: She found a program for free that started slow. Sentence 3: She started walking every day and jogging for a few minutes. Sentence 4: Soon she was only jogging every day and not walking. Sentence 5: After just three months, Renee was able to run her first 5K. Choices: a. Couch to 5K. b. Mixed Messages.

a