Which of These Could Not Be Used as a Weapon

Which of these could not be used as a weapon of mass destruction (WMD) ?

A) Releasing an epidemic disease of germs or poisons into the atmosphere.
B) Poisoning municipal water supplies with a substance designed to kill or maim at least 100,000.
C) Introducing diseases such as anthrax through the postal system.
D) Infecting a person with a deadly disease to infect as many people as possible before they die.
E) Getting infected with the flu virus and going out to full ballpark stadiums.