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'.
Example: Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Sentence 5: Marcus was happy to have the right clothes for the event. Choices: a. Marcus Buys Khakis. b. Marcus Works.
Example solution: a
Example explanation: Marcus's reasons for buying khakis is established, followed by his purchase of them and reaction.

Problem: Sentence 1: Yesterday I had a craving for a burrito. Sentence 2: I went to a local restaurant to get one. Sentence 3: When I sat down to it it, I was shocked. Sentence 4: I couldn't believe how small it was. Sentence 5: I did not want to go back there. Choices: a. That's it?. b. Scary costume.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Solution: a