Answer:
C. Portugal.
Step-by-step explanation:
The continent of South America was comprised of the various nations that colonized it. And it was through their presence that present-day South America is mostly formed of the generations from these nations or backgrounds.
One of the most prominent nations that have a huge influence in the Southern continent is the Portuguese. Portuguese is now the most spoken language and has also become the official language of Brazil. While there are also other nations such as Spain, Netherlands, etc. there has been no influence over the South American nation like that of Portugal.
Thus, the correct answer is Portugal.