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.

Title: Afraid of Heights. Sentence 1: Nick brought Carlie rock climbing. Sentence 2: He told her that she would have a great time. Sentence 3: Carlie found out real quick that she is very afraid of heights. Sentence 4: She needed to get down right away so they cut the day short. Choices: a. She had to go home. b. Carlie told Nick that she would never go rock climbing again.
b