Answer:
The correct answer is letter "D": environmental costs included in market price.
Explanation:
Oil and other resources like natural gas are used as fuel and energy sources. However, the environmental cost of extracting them is not included in the market price. If that would happen, prices of those sources would not be accessible to regular consumers.
The exploitation of oil emits methane which is a gas even more harmful to the environment than carbon dioxide. Governments in most cases regulate the oil exploitation considering the environmental impact of that activity.
