Consider Two Cylinders of Gas Identical in All Respects Except

Consider two cylinders of gas identical in all respects except that one contains O₂ and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end. Both gases are now compressed adiabatically to one-third their original volume. Which gas will show the greater pressure increase?

A) the O₂
B) the He
C) Neither; both will show the same increase.
D) It's impossible to tell from the information given.