The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is -5,074 kJ/mol. This value is the Hrxn for which of the following reactions? 

A- 2C8H18(l) + 25O2(g) 16CO2(g) + 18H2O(g)
B- C8H18(l) + 12.5O2(g) 8CO2(g) + 9H2O(g)
C- 16CO2(g) + 18H2O(g) 2C8H18(l) + 25O2(g)
D- 8CO2(g) + 9H2O(g) C8H18(l) + 12.5O2(g)