Given the task definition and input, reply with output. 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 does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Title: Slick Willie. Sentence 1: Slick Willie is a big black cat, named for his many lucky escapes. Sentence 2: Yesterday he was on the roof when we had a sudden downpour. Sentence 3: He leaped for the tree branch that was his usual method of descent. Sentence 4: He missed! Choices: a. Fortunately, he landed in a large shrub and sauntered away unharmed. b. When Sally goes home, she always writes a thank you note for her gram.
b