Given the task definition and input, reply with output. 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: Tripping Over Toys. Sentence 1: Ryan was running down the steps at his house. Sentence 2: His sister had left a toy on one of the steps. Sentence 3: Ryan tripped on the toy and fell. Sentence 4: He sprained his ankle. Choices: a. Eventually Bella fixed the jeans. b. Ryan's sister got in trouble for leaving her toys out.

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
b