What Is the Difference Between a Kilowatt and a Kilowatt

What is the difference between a kilowatt and a kilowatt hour? Which is a quantity of energy? Which is a measurement of available power?

A) A kilowatt is measure of force. A kilowatt hour is a measure of energy. Therefore a kilowatt hour is a measurement of available power.
B) A kilowatt is a measure of force per unit area and therefore a measurement of energy. A kilowatt hour is a measure of available power, metered on your electric bill.
C) A kilowatt is a measurement of the rate at which energy is delivered, which is power. A kilowatt hour is an amount of energy, which is metered on your electric bill.
D) A kilowatt is a measure of force while a kilowatt hour is a measure of energy flow. Neither is a measure of available power. Available power is the term used by the power company for its output potential.