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: Mark decides he has studied enough for a little while. Sentence 2: He leaves the library and notices some other students playing frisbee. Sentence 3: He joins them and plays for a few hours. Sentence 4: Mark is happy with his study break. Sentence 5: He decides to return to the library. Choices: a. Mark Plays Frisbee. b. Nanny and Grandpa.

a