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: Jenny bought many new T-shirts at the beginning of the summer. Sentence 2: But as she stayed in and didn't exercise, they didn't fit by August. Sentence 3: She had to give them all to a charity. Sentence 4: Now every morning she only has old shirts to wear. Sentence 5: So she's going to buy new clothes this afternoon. Choices: a. Changing size. b. Frog.

a