Q: 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: Goodbye Chester.. Sentence 1: Mick and his cat Chester had been together for 19 years. Sentence 2: Chester was mostly a house cat but he had gotten sick one day. Sentence 3: Noticing that Chester was getting worse, Mick took Chester to the vet. Sentence 4: But the veterinarian had to put the cat to sleep to end his suffering. Choices: a. He measured better the second time. b. Mick never adopted another cat after Chester.
A:
b