[单选题]
Oxygen molecules are 16 times more massive than hydrogen moleculr*u 3 9qlfquzumak8d337 cbj5es. At a given (jrrve.h5iq3b 6i)ekm li,3c temperature, how do their average molecular 3rmki ie5v.r)jbqh6 (e l3ci,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.
