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Which of the following is a good description of causality?

A) understanding a phenomenon in terms of conditional statements of the form "If x, then y." B) a very casual understanding of a topic C) understanding a phenomenon in terms of two phenomena occurring at the same time D) understanding of two phenomena that never occur at the same time E) none of the above

Currencies are bought and sold in ________ markets

A) equity B) debt C) derivatives D) foreign exchange