Detailed 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.
Q: Title: Comma. Sentence 1: Moore loved to use commas. Sentence 2: He would use commas every sentence. Sentence 3: One day, he realized he didn't know the definition. Sentence 4: He rushed to the dictionary. Choices: a. Finally, Moore was able to define a comma. b. The teams were both exhausted.
A:
a