D because Gatsby is telling him all these wonderful things
Private property can help to - (A) encourage people to keep their property clean and neat .
I think this is the right one.
The correct answer for the question that is being presented above is this one: "Looking through the boat's glass bottom, we saw brightly colored fish and even a small shark swim past us." The sentence that has a mismatch between subject and modifier is this "<span>Looking through the boat's glass bottom, we saw brightly colored fish and even a small shark swim past us."</span>