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: Kia loved exploring. Sentence 2: One day some friends invited her on a trip. Sentence 3: It was a spelunking tour, exploring caves. Sentence 4: Kia eagerly signed up for the trip. Sentence 5: She couldn't wait for the fun adventure! Choices: a. Cheesecake. b. Cave.

b