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) biological - release of epidemic disease 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 or persons with a deadly disease and sending them out to seek to infect as many people as possible before they die.
E) getting infected with the flu virus and going out to full ballpark stadiums