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: Bill's friends always complimented his cooking. Sentence 2: And one joked that he should sell his food. Sentence 3: Bill took it seriously and started selling food in his front yard. Sentence 4: He made burgers, fries, potatoes, and pizza. Sentence 5: And over time, Bill's food became very popular. Choices: a. Mary and the mountain. b. Street Food.
b