Given the task definition and input, reply with output. 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'.

Sentence 1: Bren was on a hike with her friends. Sentence 2: But she got separated somehow. Sentence 3: She was lost in the woods! Sentence 4: She stayed put and tried not to panic. Sentence 5: Luckily, it didn't take long for her friends to find her. Choices: a. Grill. b. Lost.
b