Given the task definition and input, reply with output. 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 does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Title: Something Gross. Sentence 1: Sheila was trying to give her child a bath. Sentence 2: She noticed something weird floating in the water. Sentence 3: Then she realized it was a big piece of feces. Sentence 4: She needed to clean out the entire tub. Choices: a. The sprinklers were fixed. b. Once it had been scrubbed she could finally bathe the baby.
a