Answer :
I believe the answer is A. We plan to return some day to Brazil; therefore, we want we want to visit Rio, Sao Paulo, And Manaus.
Answer:
The sentence above that is properly punctuated is A.
Explanation:
A is correctly punctuated because of the use of the semicolon. You should use a semicolon before a subordinating conjunction such as therefore when it introduces a complete sentence. What is more, it is also convenient to use a comma after such words and terms. Then, the sentence also illustrates the use of the comma to name each of the items on a list: Rio, Sao Paulo and Manaus (different cities in Brazil).