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: Tina had just turned 18. Sentence 2: She decided she was going to register to vote. Sentence 3: She was very excited. Sentence 4: She went down to the station. Sentence 5: She became a registered democrat. Choices: a. Registering to vote. b. Grown.

a