Explanation

The Falkland Current, flowing north along Argentina's coast, is a cold current. Key disputed: the question as printed is defective, because the Canary Current (option D) is also a cold current while the North Pacific and North Equatorial currents are warm — so two options are technically correct. Coaching keys mark B (Falkland), the textbook example of a cold current, as the intended answer, and B is assigned here with this dispute noted.