In Fe-Si-C alloys, why does carbon diffuse far more rapidly than the substitutionally dissolved silicon?

In Fe-Si-C alloys, why does carbon diffuse far more rapidly than the substitutionally dissolved silicon? Correct Answer Because it is an interstitial solute

If we consider the mobilities of carbon and silicon, they are actually widely different. The difference comes because silicon is a substitutionally dissolved solute and carbon is an interstitial solute hence carbon has more advantage in the diffusion process in terms of rate.
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