Q: 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: Concussion. Sentence 1: One afternoon, Jim was running down his stairs. Sentence 2: As he was running, he tripped. Sentence 3: He missed four steps and landed on his head. Sentence 4: Jim felt dizzy and was rushed to the ER. Choices: a. There the doctor told him he had a concussion. b. Afterwards, though, she came to regret impulse-buying a living being.
A:
a