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: The drive home. Sentence 1: On the drive home, Sam saw a sign for a cafe. Sentence 2: He entered the cafe for a quick coffee. Sentence 3: When he asked for a coffee, the waitress filled up his cup. Sentence 4: The cafe provided free refills, so he ended up staying for 5 cups. Choices: a. We opened the door and he repaid us with pets and affection. b. Sam was extremely alert for the rest of his drive home.
A:
b