Ideal Monatomic Gas a Is Composed of Molecules with Mass

Multiple Choice

Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m.The average molecular energies are the same if the ratio of the temperatures T_A/T_B is:

A) 1/4
B) 1/2
C) 1
D) 2
E) 4