Instructions: 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: Chase had an online math class. Sentence 2: And he was struggling to solve a problem. Sentence 3: He was sure he put the correct answer. Sentence 4: But it kept saying he was wrong. Sentence 5: After hours of struggling, his teacher said it was the website's fault. Choices: a. Taxi Ride. b. Math Error.
Output:
b