The enthalpy of combustion of propane is -2202.0 kJ/mol.
The enthalpy of combustion is released when one mole of compound is burned in the presence of excess oxygen. The bonds between carbon and hydrogen in the compound are broken and bonds between carbon and oxygen are formed as well as bonds between hydrogen and oxygen are formed.
It doesn't exactly mean anything, but it does describe the second group of elements, the Alkali Earth Metals.
Personal experience from Ag Mech classes-Concrete cools faster than metal.
The coorect answer would be A