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: Scary Nights. Sentence 1: Karen had been suffering from nightmares for several weeks. Sentence 2: She was having more and more trouble sleeping every night. Sentence 3: A friend recommended Karen try hypnotherapy. Sentence 4: Karen has several appointments with the hypnotherapist. Choices: a. There's a big circle of blood where IT fell off. b. Before long, she was sleeping much better with no more bad dreams.
b