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'.
Q: Sentence 1: Jo was in middle school. Sentence 2: She was used to getting good grades. Sentence 3: One day she forgot to study. Sentence 4: Her teacher gave a pop test. Sentence 5: Miley made her first bad grade. Choices: a. Thanksgiving. b. Grades.
A:
b