Carbohydrates: These are organic compounds made up of carbon, hydrogen, and oxygen, typically in a ratio of 1:2:1. They are not oils and fats.
Lipids: This is the correct category for oils and fats. Lipids are a group of naturally occurring molecules that include fats, oils, waxes, and certain vitamins, among others. They are hydrophobic or amphipathic small molecules.
Nucleic acids: These are biopolymers essential for all known forms of life, including DNA and RNA. They are not related to oils and fats.
Proteins: These are large biomolecules consisting of one or more long chains of amino acid residues. They are not oils and fats.
In summary, oils and fats are classified as lipids.