The correct answer is option 4, the California Current. The California Current is a cold ocean current that flows southward along the western coast of North America. It is part of the larger California Current System, which includes the California Current and the equatorward flowing Davidson Current.

Option 1, the Brazilian Current, is an warm ocean current that flows southward along the coast of Brazil. It is part of the South Atlantic Gyre.

Option 2, the Gulf Stream, is a warm ocean current that flows northward along the eastern coast of North America. It is part of the larger North Atlantic Gyre.

Option 3, the North Equatorial Current, is a warm ocean current that flows westward across the tropical North Atlantic Ocean. It is part of the larger Atlantic Meridional Overturning Circulation.

Therefore, the correct answer is option 4, the California Current.