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: Dan. Sentence 1: Keli's mom got a new boyfriend, Dan, three years after her divorce. Sentence 2: Keli loved her dad even though he had moved across the country. Sentence 3: She was determined not to let Dan take her dad's place. Sentence 4: But gradually, Dan became a friend to Keli: kind, but not pushy. Choices: a. Soon, Keli decided Dan was a pretty good guy, after all! b. But they didn't care - because the pie was delicious!
a