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

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Correct Answer: D