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: Follow the Sound. Sentence 1: Jane was in the basement. Sentence 2: She heard water running. Sentence 3: But there was no water on in the basement. Sentence 4: She checked the kitchen and bathrooms and found no water. Choices: a. A drunk driver blind-sided him, but Bob's briefcase was unscathed. b. She realized it must have been outside.
Output:
b