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: Karma. Sentence 1: I've always been a big believer in karma. Sentence 2: Especially since a girl who was mean to me in school is fat and ugly. Sentence 3: I sent a picture of her to some friends expressing that and laughing. Sentence 4: Later that day, I fell and sprained my wrist. Choices: a. I explained to her the cake had been there for a month. b. That's karma and I should have known better.
A:
b