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: Joe wanted to go to see his friend. Sentence 2: Unfortunately, he had already promised his mum he'd help her shopping. Sentence 3: Joe then told his sister, Sally, that his mum wanted help shopping. Sentence 4: Their mum then decided to take both of them along. Sentence 5: Joe learned that he would have been better off just going alone. Choices: a. Annoying Little Sister. b. Puppy Please.

a