[单选题]
A mole of diatomic oxygen molecules and a mole of diatomic nitjpbgzax k/; /nmo4)l3rogen molecule-ue)n gtj.a1(fxmi j30, lhol s at STP hm,0o l xi l3 hgjet(fuj1-n.a)ave
A. the same average molecular speeds.
B. the same number of molecules.
C. the same diffusion rates.
D. all of the above