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: Sam wanted the lunch cost to go down in his school. Sentence 2: He started a petition. Sentence 3: He asked for signatures in the cafeteria. Sentence 4: He gave it to the student council. Sentence 5: The student council reduced the lunch cost. Choices: a. The bet. b. lunch cost.

b