Answer:
d).a nutrient rich upwelling current occurs along the coast of South America
Explanation:
El nino : El Nino occurs in Pacific region which produces global effect on weather patterns. It is climatic cycle and it occurs when warm waters in Western pacific oceans shifts towards the east of the coastal region of South America.
A nutrient rich upwelling current occurs along the coast of South America because the thermocline prevents the quantity of nutrients coming from the ocean surface by upwelling process along the coastal region of South America.