What are the choices given here? Anyway, if the question is whether the sentence "The couple looked closely at the exterior of the house, they noticed; the paint was in disrepair." uses correct punctuation, I shall answer that it does not.
It could possibly be: The couple looked closely at the exterior of the house; They noticed the paint was in disrepair.
Answer:
C.
Explanation:
It's the only sentence that doesn't use slang, has proper punctuation, and no spelling errors.