Vast amounts of oil revenues had what consequence in Iran?

a. Citizens paid very little for gasoline and heating oil.
b. Oil helped fuel democratic reforms within the state.
c. The state was able to attract foreign investment in the manufacturing sector due its ability to offer tax incentives.
d. The oil fields had a detrimental impact on agriculture leading to several devastating famines.
e. The state became independent of society since it did not depend on society for tax revenue.

e