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: Christmas Tree. Sentence 1: It was time to go pick out our Christmas tree. Sentence 2: Everyone got in the van. Sentence 3: We went to the tree lot. Sentence 4: Dad picked the biggest tree they had. Choices: a. Cal had to prove to the court his speedometer wasn't working. b. We had trouble riding home with it.
A:
b