Would it be a correct me if im wrong
I'm going to guess B but I'm not sure
One gallon equals to 4 quarts.
The instructions tell you to add 1 part of cleaner and 3 parts of water, in total 4 parts. It makes it easy as you can take that one part = one quart.
You will use 3 quarts of water and 1 quart of cleaner. The answer is D.