Answer: "Hydrocarbon" best describes a compound that contains only carbon and hydrogen atoms. The best option to answer the question is the fourth one (letter D).
Step-by-step explanation:
The question requires us to identify, among the options given, which one best describes "A compound that contains only carbon and hydrogen atoms".
By definition, hydrocarbon describe a class of organic compounds that are made up only of the elements carbon and hydrogen. On the other hand, an aromatic compound can be described as a conjugated planar ring system accompanied by delocalized electrons, while saturated and unsaturated describe the presence or not of double C to C double bonds in a molecule (saturated molecules present only single C to C bonds, while unsaturated present at least one C to C double bond).
Therefore, considering the definitions above, we can say that "hydrocarbon" best describes a compound that contains only carbon and hydrogen atoms. The best option to answer the question is the fourth one (letter D).