Answer:
The answer to your question is: Gasoline is a mixture of hydrocarbons.
Step-by-step explanation:
A mixture is composed by 2 or more compounds.
A compound is a pure substance.
According to the paragraph, gasoline is composed by octane, nonane, decane, dodecane, etc, each of these compounds is different, so gasoline is a mixture of hydrocarbons.
Hydrocarbons are composed only by carbon and hydrogen. we can distinguish them by the number of carbons in their structure.