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: Ari set up a fish tank for his family. Sentence 2: But his fish started to act strangely! Sentence 3: He called a pet store representative right away. Sentence 4: She walked Ari through the steps to correct his water parameters. Sentence 5: Soon Ari's fish were behaving normally- and happily! Choices: a. Fish Tank. b. Nerves for the date.

a