Answer: D.
Natural gas is a cleaner resource than crude oil.
Step-by-step explanation:
Crude oil contaminate the environment. This is referred to as crude oil pollution and it is estimated that 80% of crude oil pollution is as a result of spillage Currently, about 80% of land are polluted by products of petroleum origin. The burning of crude oil also affect the ozone layer.
Natural gas is more environmental friendly than crude oil.