Given the task definition and input, reply with output. 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: Donald liked Mexican food. Sentence 2: He opened his own Taco Truck. Sentence 3: He drove it to a big festival downtown. Sentence 4: The line wrapped around the block. Sentence 5: Everyone heard about how good his food was. Choices: a. Model. b. The Taco Truck.
b