You will be given a definition of a task first, then some input of the task.
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: Airplane Ride. Sentence 1: My first airplane ride happened when I was about nine years old. Sentence 2: I was very nervous to be riding on an airplane. Sentence 3: I thought for sure that the airplane would fall out of the sky. Sentence 4: But, I actually had an amazing flight, and even got snacks. Choices: a. About an hour later I had landed at my destination safe and sound. b. Then his co worker introduced Charles to his idol, Ahmad the rapper.
Output:
a