[单选题]
Oxygen molecules are 16v+dde,xq x0)v times more mas3/im(rmsb8-mf 2 whhssive than hydrogen molecules. At a given temperature, how do their average mole(s2 mw/m i rh3ms-bf8hcular speeds compare? The oxygen molecules are moving
A. 4 times faster.
B. at 1/4 the speed.
C. 16 times faster.
D. at 1/16 the speed.
