Question on Thermochemistry

The heats of combustion of carbon and carbon monoxide are \(–393.5 kJ mol^{-1}\) and \(–283.5 kJ mol^{–1}\), respectively. The heat of formation (in kJ) of carbon monoxide per mole is 

A) 676.0

B) –676.0 

C) –110.0

D) 110.0