You will be given a definition of a task first, then some input of the task.
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: Trilogy. Sentence 1: Cora wanted to write a trilogy. Sentence 2: She thought it'd be easy as she knew the plot for the first two books. Sentence 3: She wrote them and got a decent success. Sentence 4: But when the time arrived to write the third book she had nothing. Choices: a. Lisa freaked out and told her this was her therapy. b. So she hired a ghostwriter to fulfill her obligation to her editor.
Output:
b