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: I used to work for a transit authority in Boston. Sentence 2: One day, I took two other office workers on a field trip. Sentence 3: We visited a carhouse in East Boston. Sentence 4: We took selfies in the cabs of the subway cars. Sentence 5: I got to drive the car in the yard. Choices: a. Angela's New Phone. b. Blue Line.

b