Which of the following statements is true?

• A.an increase in the temperature of a given mass of gas increases the number of gas molecules
• B.an increase in the temperature of the gas does not affect the kinetic energy
• C.an increase in the pressure of the gas is proportional to the increase in volume
• D.a decrease in the pressure of a gas is proportional to the decrease in volume at constant temperature
• E.a decrease in the pressure of the gas decreases the number of gas molecules present