The correct answer is: (Choice C) Water is polar and oil is nonpolar.
Water is a polar molecule, meaning it has a positive and a negative end due to the unequal sharing of electrons between hydrogen and oxygen. Oil, on the other hand, is nonpolar, meaning its electrons are distributed more evenly. Because of this difference in polarity, water cannot effectively dissolve oil; generally, "like dissolves like," meaning polar substances tend to dissolve in polar solvents, and nonpolar substances dissolve in nonpolar solvents.