"The Specific Heat of an Ideal Gas at Constant Pressure

Multiple Choice

"The specific heat of an ideal gas at constant pressure C_p is greater than the specific heat of a gas at constant volume C_v." Which of the following describes this statement?

A) The statement is true because there is always more gas at constant pressure.
B) The statement is true because,to raise the temperature of a gas at constant pressure,work must be done by the gas.
C) The statement is true because,to raise the temperature of a gas at constant volume,work must be done by the gas.
D) The statement is not true; C_v > C_p.
E) The statement is not true; C_p = C_v.