In the 1970s, OPEC demonstrated that
a. The only way to defeat Israel was for all Arab states to work together.
b. An alliance in control of a valuable resource could exert control over the global economy.
c. Western powers could no longer dominate the Suez Canal.
d. Overproduction of petroleum products can cause a slump in global prices.
In the 1970s, OPEC demonstrated that "b. An alliance in control of a valuable resource could exert control over the global economy," since they restricted the production of oil in order increase prices.
