Which of the Following Is NOT True of Iran's Economy

Which of the following is NOT true of Iran's economy prior to the Islamic Revolution?

A) Iran was an important member of OPEC.
B) Iran was a major purchaser of arms, especially from the United States.
C) Many landowners stopped growing food and turned to commercial export crops leading to several disastrous famines.
D) The country became dependent on oil as a commodity that was subject to volatile market prices.
E) Iran had significant trade relations with neighboring and other developing countries.