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: Sally wanted to have a picnic with her friend this weekend. Sentence 2: They decided to have it at the park. Sentence 3: They brought all of their favorite foods. Sentence 4: It wasn't until they finished that they noticed a beehive above them. Sentence 5: Luckily, the packed up before disturbing the beehive. Choices: a. No help. b. Picnic.
b