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In the 1970s, OPEC demonstrated that

AThe only way to defeat Israel was for all Arab states to work together.
BAn alliance in control of a valuable resource could exert control over the global economy.
CWestern powers could no longer dominate the Suez Canal.
DOverproduction of petroleum products can cause a slump in global prices.

Verified Answer :

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. 

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