Answer:
C. kilojoules
Step-by-step explanation:
The bond energy needed to break or create bonds is measured in units called kilojoules.
Bond energy is a form of enthalpy change of a reaction or physical change. The bond energy is the heat content of a covalent bond formed from its constituent elements in the gas phase.
The bond energy is the same in value as the bond dissociation energy and its unit is given in kilojoules.