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: Dave was failing in physics. Sentence 2: This wasn't good because Dave wanted to be an engineer. Sentence 3: Dave got a campus tutor and worked very hard. Sentence 4: Dave studied day and night. Sentence 5: Dave aced the exam and passed the physics course! Choices: a. Big Buttons. b. Physics.

b