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: Last week Kate's class took pictures. Sentence 2: Today was the day the pictures came back. Sentence 3: Her friends were exchanging photos. Sentence 4: Kate did as well without asking her mother first. Sentence 5: Her mother was very angry she had given away the photo's. Choices: a. Deciding on a movie. b. Exchange.

b