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: Air Quality. Sentence 1: The man opened the window. Sentence 2: The fresh air blew in. Sentence 3: The wife enjoyed the fresh air. Sentence 4: She opened another window. Choices: a. Over time the air quality continued to improve. b. He was excited and put on a fun match.
Output:
a