Fact 1: Fire converts chemical energy into light and heat energy. Fact 2: Fuel has a chemical energy. Given the two facts above, what converts fuel into light and heat energy ?

Pick from:
A). warmth;
B). Lift;
C). food;
D). fire;
E). NaCl;
F). Cars;
G). trees;
H). reacts;
The answer is:
D).