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: Yolanda wanted to go to the horse races. Sentence 2: She asked some friends if they wanted to go with her. Sentence 3: Three of her friends said they would be able to go. Sentence 4: The four friends rode together to the race track. Sentence 5: They all enjoyed the races and had a great day together. Choices: a. The Wrong Sandwich. b. Horse race.
b