Answer:
E) Oil imports declined as countries exporting oil reduced supply.
Explanation:
Oil is extremely important for industrialized nations and since Euphrasia is a mixed open economy, we can assume that it is an industrialized nation. Oil has become the most important energy source for more than 60 years and is the raw material for manufacturing plastic.
During the 1970s and early 1980s the American economy was shattered by an increase in the price of foreign oil and a decrease in its domestic production levels. The importance of oil is also why so many modern wars have been fought over oil production and reserves.