The Correct answer is C.

Explanation

To solve this problem, you must realize that some of the? also own cats and some of the??cat owners also own dogs. This has to be true because? is more than?! The question asks how many of the dog owners do not own cats. To solve the problem, first find the number of people who own both a dog and a cat. To do this, let??equal the number who own?both a dog and a cat. Then?. (Note: Adding??and??counts? twice, so?must be subtracted from the sum to get?.)?Next, the equation?can be solved for?, yielding?.?Finally, the number of dog owners who own no cat is?.