Consider Three 1-L Flasks at the Same Temperature and Pressure

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N₂ gas, and flask C contains O₂ gas.In which flask do the molecules have the greatest momentum per impact?

A) The molecules in all the flasks have the same momentum per impact.
B) flask C
C) The molecules in two of the flasks have the same momentum per impact.
D) flask A
E) flask B