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: I was teaching my son some numbers. Sentence 2: He could only count to three. Sentence 3: I held up four of my fingers. Sentence 4: He thought about it real hard. Sentence 5: He did not know what number that was. Choices: a. The Marathon. b. Numbers.

b