Which of the Following Is TRUE of Iran's Economy in the Pre-Islamic

Which of the following is TRUE of Iran's economy in the pre-Islamic Revolutionary period?

A) It was an important member of OPEC.
B) It was a major purchaser of arms, especially from the United States.
C) It imported many products from the West that sometimes had a detrimental effect on domestic production.
D) The country became dependent on oil as a commodity that was subject to volatile market prices.
E) All of the above are true of Iran's economy in the pre-Islamic Revolutionary period.