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: Annie's December. Sentence 1: It was the coldest December on record. Sentence 2: Annie was finally wrapped up by the fire in her apartment. Sentence 3: Her car had broken down on her way home. Sentence 4: She had been stuck in the snow for five hours. Choices: a. She had been so relieved when the tow truck arrived. b. Suddenly his family came in and surprised him with a birthday party.
A:
a