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: Ken entered a marathon. Sentence 2: He didn't train all that much. Sentence 3: He was not properly prepared on the day of the marathon. Sentence 4: Ken only made it a fourth of the way before giving up. Sentence 5: He was too exhausted to continue. Choices: a. Working Out. b. Too Exhausted.

b