Art Owns Significant Interests in a Hardware Store and a Bookstore

Art owns significant interests in a hardware store and a bookstore at a mall in Washington, D.C. He also owns a hardware store and a bookstore at a mall in San Francisco. Which of the following is not a way in which the interests may be grouped?

A) One activity.
B) A hardware activity and a bookstore activity.
C) A Washington, D.C. activity and a San Francisco activity.
D) Four separate activities.
E) Any of the above may be the basis for grouping.