[单选题]
Oxygen molecules are 16 times more massive than hydrogen molecules. At ocy e2 yq1n ggp4f:e(4ate nabm4 7jt;l q::58du 3skho given temperature, how do theirnmod5t:k tsl ;8hu3eq4jb:7 a average molecular 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.
