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: After a semester of hard work, I finally got an A in my math class. Sentence 2: I had attended every lecture, no matter how boring it was. Sentence 3: I did every homework assignment, even the difficult ones. Sentence 4: Although I wanted to quit, I persevered through the class. Sentence 5: I'm proud of my grade. Choices: a. Credit Card. b. Class.

b