A 10-L Flask and a 1-L Flask Each Contain Two $25 ^ { \circ } \mathrm { C }$

A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at $25 ^ { \circ } \mathrm { C }$ . Which of the following statements about these gases must be true? (There could be more than one correct choice.)

A) The internal (thermal) energy of the gas in the smaller flask is greater than the internal (thermal) energy of the gas in the larger flask.
B) The molecules in the larger flask have the same root-mean-square speed as those in the smaller flask.
C) The internal (thermal) energy of the gas in the larger flask is greater than the internal (thermal) energy of the gas in the smaller flask.
D) The molecules in the smaller flask have the same average kinetic energy per molecule as those in the larger flask.
E) The internal (thermal) energy of the gas in both flasks is the same.