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: Sheila went to her apartment late at night. Sentence 2: Suddenly, she heard uneven sound from her room. Sentence 3: She was so scared and don't know what to do. Sentence 4: When she's inside her room she saw a ghost and she began to cry. Sentence 5: Until her friends showed up and she realized it's just a prank. Choices: a. best friends. b. prank.

b