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: Moving Kittens. Sentence 1: The Smith family got two new kittens. Sentence 2: After a couple of days their youngest child got sick. Sentence 3: When the doctor looked at him it was obvious he was allergic. Sentence 4: Though the family was sad they knew what they had to do. Choices: a. Very quickly a new loving home was found for the kittens. b. I plan on going to do it tomorrow.
a