Final answer:
The factor that doesn't violate the assumptions of the Hardy-Weinberg law is genetic drift.
Step-by-step explanation:
The factor that doesn't violate the assumptions of the Hardy-Weinberg law is c) Genetic drift. The Hardy-Weinberg law describes the conditions for a population to be in genetic equilibrium, meaning that allele frequencies remain constant from generation to generation. Genetic drift refers to random changes in allele frequencies due to chance events, but it does not violate the assumptions of the Hardy-Weinberg law. In contrast, natural selection, mutation, and gene flow can all introduce changes to allele frequencies and thus violate the law.