c. take hundreds of millions of years to form.
b. are in such high demand.
d. pollute the air.
well... the environmental effects could be because of pollution. Bad waste and air pollution can cause respiratory (breathing) problems. This is because the contaminants could be absorbed into the body. Soil contamination also because hazardous chemicals could get into the soil.
B.Saudi Arabia
C.Iran
D.Yemen
Answer: The answer is B
Explanation: