You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: Billy knew he needed to shoot. Sentence 2: He readied to throw the ball into the hoop. Sentence 3: The clock was ticking down. Sentence 4: He shot the ball. Sentence 5: The ball went in! Choices: a. Jet-lagged. b. Buzzer Beater.
Output:
b