Answer: refineries, where the crude is processed into gasoline and other fuels
Step-by-step explanation:
Before oil can be used, it needs to be processed into various fuels such as gasoline and airplane fuel. This is done in refineries that extract these fuels by using boiling point technology.
Oil trains transport oil to these refineries for the processing to be done. Options A and B are ruled out because oil needs to be processed first and option C is rued out because oil is not normally transported by air because it is expensive and dangerous.