Statement: For an ideal gas at constant temperature, the product of the pressure and volume is a constant.

• A. Reason: The mean square velocity of the molecules is inversely proportional to mass.
• B. Both statement and reason are true and explanation is the correct explanation of the statement
• C. Both statement and reason are true but the explanation is not a correct explanation of the statement
• D. Statement it true but the reason is false
• E. Both statement and reason are false