The correct answer is C: Brazil, Venezuela, Colombia, Ecuador, Chile, Argentina, Peru, and Bolivia.
When listing places that contain commas (such as cities and states), you need to use semicolons to separate the items to avoid confusion. In this case, each country in the list is separated by a comma, so semicolons are needed to clearly separate each entry.
So the correct format would be: Brazil; Venezuela; Colombia; Ecuador; Chile; Argentina; Peru; and Bolivia.