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.

Title: Bike. Sentence 1: Randal wanted to buy a new bike. Sentence 2: His old bike was completely worn down. Sentence 3: He decided to visit his local sports and outdoors store. Sentence 4: He left spending three hundred dollars on his bike. Choices: a. Randall loves his new bike. b. Amazingly, the fish swam around as if nothing had happened.
a