Given the task definition and input, reply with output. 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'.

Sentence 1: Allie went shopping yesterday. Sentence 2: Her eyes caught a beautiful dress. Sentence 3: She really wanted it. Sentence 4: But unfortunately it was not for sale. Sentence 5: Allie was crushed. Choices: a. Gymnastics. b. Not for sale.

b