Detailed Instructions: In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.
Q: Title: Barista Birthday. Sentence 1: Tom got his coffee every morning before work. Sentence 2: Tom got this coffee from the same Starbucks each morning. Sentence 3: Doing this, Tom developed a friendship with the barista. Sentence 4: One morning Tom learned the following day was the barista's birthday. Choices: a. It was all worth it because I could afford my own horse after a year. b. Tom left her a one hundred dollar tip for her birthday!
A:
b