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: Jim went hiking alone at the state park. Sentence 2: He did not know there was a flash flood warning. Sentence 3: Jim was trapped on a hilltop by the raging river. Sentence 4: Fortunately, he had a cell phone that he used to call for help. Sentence 5: Jim had to be rescued by a helicopter. Choices: a. Trick or Treating. b. Flash Flood.

b