Final answer:
During La Niña years, the upwelling of cold water off the coast of South Africa leads to drier than normal conditions around South America.
Step-by-step explanation:
During La Niña years, the upwelling of cold water off the coast of South Africa leads to drier than normal conditions around South America. The cold water from the upwelling cools the air, reducing its ability to hold moisture, which leads to lower humidity and less rainfall. As a result, there is a higher likelihood of droughts in the affected regions.