Which of the following statement(s) is(are) correct regarding the root mean square speed (Urms) and average translational kinetic energy (Eav) of a molecule in a gas at equilibrium ? (A) Eav at a given temperature does not depend on its molecular mass (B) Urms is doubled when its temperature is increased four times (C) &av is doubled when its temperature is increased four times (D) Urms is inversely proportional to the square root of its molecular mass