Suppose That We Have Two Containers, One Holding $N$ Molecules of Helium Gas, and One Holding

Multiple Choice

Suppose that we have two containers, one holding $N$ molecules of helium gas, and one holding $N / 2$ molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?

A) The helium
B) The oxygen
C) Both have about the same temperature.
D) One cannot say without measuring.