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: Vivian arrived at the beach very late. Sentence 2: The sunset had attracted a lot of people. Sentence 3: She joined them and saw the sun disappear. Sentence 4: When everyone left, she went for a swim. Sentence 5: And then, she saw the moon climb in the sky where it shined. Choices: a. Joey gets lost. b. Beach at sunset.

b