Which of the Products in Figure 3-3 Above Is Least

Which of the products in Figure 3-3 above is least likely, at this point in time, to be concerned with having its name become generic?

A) Kleenex because most people just ask for a tissue.
B) Jell-O because there are not other gelatin desserts.
C) All Sport Disk because most people call it a Frisbee.
D) Q-Tips because most people call it a cotton swab.
E) Vaseline because most people refer to it as petroleum jelly.