If dominant alleles of two gene loci produce the same phenotype whether inherit separately or together, it will be

The correct option is B duplicate genes interaction
In duplicate genes interaction, dominant alleles of two gene loci produce the same phenotype whether inherit separately or together.

In dominant epistasis, the dominant allele of one gene masks the expression of all alleles of another gene.

In recessive epistasis, the recessive alleles of one gene mask the expression of all alleles of another gene.

Inhibitory genes interaction is a dominant allele at one locus can mask the expression of both (dominant and recessive) alleles at second locus.

So, the correct answer is "option C"