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: Tina and her friendship with Erica was going down the tubes. Sentence 2: The two girls were just not getting along. Sentence 3: Tina apologized to Erica. Sentence 4: Erica did not accept the apology. Sentence 5: Tina felt defeated. Choices: a. No apology accepted. b. Freezing beach.
a