If ray completely separates a mixture, what will he have when he if finished?

If Ray completely separates a mixture, he will be left with pure substances.

Mixtures are of two types: homogeneous and heterogeneous.

Homogeneous mixtures are made up of pure substances in definite proportion with uniform composition.

Heterogeneous mixtures are made up of pure substances in varying proportion.

Although  mixtures are of two types essentially all mixtures are made up of pure substances.

it is the most commonly accepted one

the answer is d.) potassium