Final answer:
A solute made of nonpolar molecules is the best choice for a solvent made of nonpolar molecules.
Step-by-step explanation:
The type of substance that would best dissolve in a solvent made of nonpolar molecules is a solute made of nonpolar molecules.
Nonpolar substances, like oil, do not dissolve in polar solvents like water. They are more attracted to themselves than to the polar molecules in the solvent. Therefore, for a nonpolar solvent made of nonpolar molecules, a solute made of nonpolar molecules is the best choice for dissolution.