The answer is (A).
the question describes a claim (economic problems caused by OPEC), and then argues this claim is wrong by pointing to a case which doesn't fit the pattern of the claim (Britain, which had economic problems without OPEC) - this is called a counterexample.
the question describes a claim (economic problems caused by OPEC), and then argues this claim is wrong by pointing to a case which doesn't fit the pattern of the claim (Britain, which had economic problems without OPEC) - this is called a counterexample.
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