Instructions: 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: Today my sister-in-law delivered three bags of books. Sentence 2: I sell books online for family and friends. Sentence 3: The books were from my niece's college book drive. Sentence 4: I listed ten books. Sentence 5: Within an hour I had sold one. Choices: a. Books. b. Apples.
Output:
a