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: Lara went hiking in a hill in Arizona. Sentence 2: Her right hand brushed a jumping cactus. Sentence 3: Her dad removed over 300 needles from her hand. Sentence 4: She looked forward to showing the inflamed hand to friends. Sentence 5: She was sad the hand looked normal the next day. Choices: a. William's birthday. b. Lara Becomes Sad.
b