Choose the best concluding statement for the paragraph.
a) puerto rico ought to be independent and refuse commonwealth with the united states of america.
b) puerto rico's independence is ultimately an internal question, entirely the affair of its citizens.
c) in spite of some good arguments for independence, puerto rico is better off staying a part of the usa.
d) there are some excellent arguments for puerto rico to go independent, and some good arguments for them to remain a commonwealth as well.