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: Custody. Sentence 1: Jay and Shari have two kids together. Sentence 2: They had a lot of problems and could no longer stay together. Sentence 3: Shari tried to take the children away from Jay. Sentence 4: But Jay was one step ahead of her and already filed custody papers. Choices: a. They went to court and Jay won custody of both children. b. Cece refused his demands because her children have the same last name.
a