Instructions: 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.
Input: Title: Nervous Sara. Sentence 1: Sara was on edge. Sentence 2: She knew her daughter's death anniversary was nearing. Sentence 3: Sara tried to focus on other things. Sentence 4: She threw herself into her work. Choices: a. Keeping busy helped put her mind on other things. b. Then we wondered why it got so dark so early.
Output:
a