The only products that come out of a fuel cell are（）.No pollution or other dirty byproducts come out of the tailpipe of a fuel cell car.

The only products that come out of a fuel cell are（）.No pollution or other dirty byproducts come out of the tailpipe of a fuel cell car.
A.energy， water vapor， and oxygen
B.electricity and hydrogen
C.electricity， heat and water
D.water and oxygen
正确答案：electricity， heat and water