During One Stage of a Reversible Process,the Temperature of an Ideal

Multiple Choice

During one stage of a reversible process,the temperature of an ideal gas remains constant as its volume is decreased.Which one of the following statements concerning this situation is true?

A) The process is adiabatic.
B) The pressure of the gas decreases in this process.
C) Heat flows out of the gas and into the surroundings.
D) The gas does "positive" work on its surroundings.
E) The average kinetic energy of the gas molecules increases.