Explanation

The California Current is a cold ocean current — it is the eastern boundary current of the North Pacific that carries cold water southward along the west coast of North America, making option D the incorrect statement. The Gulf Stream is a warm western-boundary current of the North Atlantic (option A is correct). The North Atlantic Drift, its north-eastward extension toward Europe, is likewise a warm current (option B is correct). The Labrador Current flows southward from the Arctic along Canada's east coast and is a cold current (option C is correct). Since the question asks for the statement that is NOT correct, the answer is D.