You will be given a definition of a task first, then some input of the task.
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: Eunice usually goes home early after school. Sentence 2: But one afternoon it was already late and Eunice was not yet at home. Sentence 3: Her parents was nervous thinking eunice might be in trouble. Sentence 4: They tried to call her and luckily Eunice answered. Sentence 5: Eunice took hours waiting for a bus because of heavy rain. Choices: a. heavy rain. b. Stubborn Illness.
Output:
a