In the study of physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two element?

• A.temperature is a measure of the average kinetic energy of the molecules of a substance
• B.heat is a measure of the total kinetic energy of the molecules in a system
• C.different materials require different amounts of heat to cause a given change in temperature
• D.all of the above
• E.A and B only