When weather conditions are disrupted by El Niño, this affect ocean nutrients by "Ocean upwelling decreases, resulting is lower levels of nutrient-rich water".
Answer: Option A
Step-by-step explanation:
Trade winds usually blow in the Pacific from East to West, driving warm ocean surface waters through Asia. It triggers the upwelling of cold ocean currents from the ocean depths on South America's west coast, carrying nutrients up from the depths.
El Nino is triggered basically by the interaction between the tropical Pacific Ocean surface layers and the above environment. Some trade winds intensify during Elnino, however, and prevailing winds blow eastward, minimizing this upwelling of cooler deeper waters.