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: Bill was at a stop light. Sentence 2: The light was on red. Sentence 3: Billy began to look around while waiting. Sentence 4: He suddenly heard a horn behind him. Sentence 5: The light had turned green. Choices: a. Seeing a fox. b. Red Light.

b