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: Beach Day. Sentence 1: Andrew really wanted to go surfing. Sentence 2: He couldn't wait to get out of school. Sentence 3: The school bell rung. Sentence 4: He ran quickly to the beach. Choices: a. Now we have a brand new nice roof. b. He had the time of his life.
A:

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