Answer:
c)
Step-by-step explanation:
Shale oil is already produced and used in many parts of the world in power plants, but is generally only used to produce crude oil when the price of oil is high. This is due to the fact that oil extraction from shale is more complex and more expensive than the production of a barrel of regular crude oil. Since crude.
Since crude oil can indeed be obtained from shale, albeit it at a higher price, the production of shale oil is largely defined by political and economic factors.