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: It was a special day. Sentence 2: It was the anniversary of a national disaster. Sentence 3: The people gathered around to remember the people who had died. Sentence 4: They had a special ceremony. Sentence 5: The people vowed to never forget. Choices: a. The Anniversary. b. Good Deed.
a