The correct answer are <em>C) Countries traded with other oil-producing nations, and D) Nations stopped building automobiles for a while.
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The OPEC oil embargo completely stopped the exports of oil to the United States. The decision was taken by the 12 members of OPEC on October 19, 1973, in retaliation for the U.S. decision to re-supply the Army of Israel. What happened then was that <u>oil prices quadrupled</u> in the subsequent months. The embargo ended in March 1974.
After the embargo, the United States set in motion measures to conserve and develop domestic energy sources. The government created the <u>Strategic Petroleum Reserve</u> and limited the speed in highways to 55-miles-per-hour.
In the 1800s the Great Plains region of the United States was characterized by: Vast expanses of native grasses.
I found that it's "<span>Entrepreneurs earn profits when consumers buy products at prices high enough to cover their production costs." I hope this helps!</span>
