Concept:Cold ocean currents reduce rainfall along tropical and equatorial coasts.Explanation:Equatorial regions normally receive heavy rainfall because of high temperatures and strong convection.When a cold current flows along the coast, it cools the air above it.Cooled air becomes stable and reduces evaporation and rising air currents, so clouds and rainfall are suppressed.As a result, the coast receives less rainfall than expected for its equatorial location.Answer:A. presence of a cold current