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.
Input: Title: First flight.. Sentence 1: Aaron had never traveled by plane. Sentence 2: He had to travel for a business launch 6 hours away. Sentence 3: His boss insisted he fly by plane to arrive on time. Sentence 4: Aaron felt lightheaded and afraid the entire flight. Choices: a. When the plane landed, Aaron sighed with relief. b. Olga responded with silence this time.
Output:
a