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: Nina went mountain hiking. Sentence 2: She made it halfway up the mountain. Sentence 3: The sky began to get dark as dusk set in. Sentence 4: Suddenly she noticed the beautiful sunset. Sentence 5: Nina felt inspired and encouraged to continue on the hike. Choices: a. Mountain Sunset. b. New pants.

a