(8) Interstitial diffusion is generally faster than diffusion by vacancy mode. This is because:
(A) number of interstitial sites is greater than vacancies,
(B) vacancy diffusion requires more energy than interstitial diffusion,
(C) interstitial species are smaller than substitution species,
(D) all of the mentioned.

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統計： A(0), B(1), C(0), D(0), E(0) #2796234