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'.
Q: Sentence 1: Yesterday we were in the longest traffic jam ever. Sentence 2: I was waiting forever for people to move. Sentence 3: An hour later they finally moved. Sentence 4: But I realized it was an accident. Sentence 5: It was quite sad. Choices: a. Waiting. b. Longest traffic.
A:
b