Which of the Following Best Matches the Description

Which of the following best matches the description?
-Burning of fuel to obtain heat.

A) respiration
B) pH
C) enzyme
D) ion
E) photosynthesis
F) acid
G) combustion
H) potential energy
I) none of above
J) base
K) proton
L) electron
M) isotope
N) neutron
O) kinetic energy
P) nucleus
Q) entropy
R) latent heat