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: Bob took Ana to the ocean to go swimming. Sentence 2: Ana exclaimed the water was dark and cold. Sentence 3: Bob agreed but pointed at the stars. Sentence 4: Bob and Anna stood in the salty waves, looking up. Sentence 5: Filled with such awe, they both forgot how cold the water was. Choices: a. Penny's party. b. Dark and Cold.

b