Hey there!
Here is your answer:
The proper answer to this question is " corn, coca, coffee, and sweet potato".
Reason:
Cash crops are crops that make the country wealthy most importantly gives that country its wealth and because of these crops it has its wealth.
Also....
Corn, coca, coffee, and sweet potato are one of the most common cash crops in South America!
Therefore the answers are corn, coca, coffee, sweet potato!
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit