How the gas pressure will change a) if the concentration of gas molecules is increased by 4 times at a constant rms velocity of molecules;

How the gas pressure will change
a) if the concentration of gas molecules is increased by 4 times at a constant rms velocity of molecules;
b) if the root-mean-square velocity of gas molecules is increased by 4 times with a constant concentration of molecules;
c) if the average kinetic energy of molecules is increased by 3 times with a constant concentration of molecules;
d) if the average kinetic energy of molecules is increased by 4 times, and the concentration of molecules is reduced by 2 times;
e) if the concentration of gas molecules is increased by 2 times, and the root-mean-square velocity is decreased by 4 times?

a) the pressure will increase 4 times;
b) the pressure will increase 16 times;
c) the pressure will increase 3 times;
d) the pressure will double;
e) the pressure will decrease by 2 times;