Polyunsaturated vegetable oils can be changed from liquids to solids by

A) adding more unsaturated fatty acids to the molecules.
B) removing the glycerol portion of the molecules.
C) decreasing the number of double covalent bonds in their fatty acids.
D) removing hydrogens from the molecules.

Polyunsaturated vegetable oils can be changed from liquids to solids through a process called hydrogenation, which decreases the number of double covalent bonds in their fatty acids. This process adds hydrogen atoms to the oil, converting unsaturated fats to saturated fats and thereby solidifying them.