Fuel Cells Are Attractive for Many Reasons, but Which of the Following

Fuel Cells are attractive for many reasons, but which of the following is considered one of the major disadvantage when dealing with fuel cells?

A) The range of a fuel cell vehicle is less than a traditional car.
B) The electric motors are too difficult to run with fuel cells.
C) The best fuels are gases making them more difficult to handle.
D) The side products from fuel cells reactions are harmful to the environment.
E) None of the above.