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: Adam was a prankster. Sentence 2: He wanted to scare his sister. Sentence 3: He put on a clown costume. Sentence 4: He waited in the bathroom for her. Sentence 5: He scared her when she entered. Choices: a. Stagnation. b. Scary.

b