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: Nick and Jeffrey wanted to go into an old abandoned hospital one day. Sentence 2: When they got there, there was a locked gate. Sentence 3: They tried to climb over the gate. Sentence 4: Suddenly, a security guard appeared and started yelling at them. Sentence 5: Disappointed, they had to promise never to try to break in again. Choices: a. Shutting Down. b. Security.

b