Same gas is filled in two vessels of the same volume at the same temperature. If the ratio of the number of molecules is 1 : 4, then
A. The r.m.s. velocity of gas molecules in two vessels will be the same.
B. The ratio of pressure in these vessels will be 1 : 4
C. The ratio of pressure will be 1 : 1
D. The r.m.s. velocity of gas molecules in two vessels will be in the ratio of 1 : 4