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: Rafting. Sentence 1: Anna went on a white water rafting trip with her friend. Sentence 2: The brochure had made it look fun. Sentence 3: But the real trip was not so fun. Sentence 4: It was terrifying in the rough rapids! Choices: a. Anna was so angry at having to clean up the big mess! b. Anna was glad when the trip ended.
A:
b