Determine [a] Homogenization rate in a dilute substitutional solid solution of B in A is controlled by B diffusivity; and [r] Atomic migration cannot occur along dislocations and grain boundaries.
Both [a] and [r] are true and [r] is the correct reason for [a].
Both [a] and [r] are true but [r] is not the correct reason for [a].
Homogenization smooths solute-concentration gradients by diffusion; in the stated dilute solution, the diffusion of B controls that process, making [a] true. Grain boundaries and dislocation cores can provide fast diffusion paths, so [r] is false. The combination is D.
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