Answer:
D. Saturated.
Step-by-step explanation:
Let's remember the concept of alkanes: An alkane is a hydrocarbon in which there are only single covalent bonds.
Remember that a hydrocarbon is an organic compound that is made up of only carbon and hydrogen, and aromatic hydrocarbons are molecules that contain benzene rings.
Now, an unsaturated molecule has double or triple bonds, whereas a saturated molecule has just simple bonds (this means more hydrogen atoms, that's why it's called saturated).
Alkenes are hydrocarbons that have double bonds, and alkynes are hydrocarbons that have triple bonds.
As we already know, based on the logic of the given definitions, alkanes, alkenes, and alkynes are hydrocarbons, but alkenes and alkynes are unsaturated molecules, but alkanes are saturated molecules.
The answer would be D. Saturated.