What point is the author trying to make about exploring Mars? Describe the author's point and how he supports this point with reasons and evidence from the text.

Mexico city the capital is also the cultural center of the country.
which answer shows proper comma usage?
mexico city the capital is, also the cultural center of the country.
mexico city, the capital, is also the cultural center of the country.
mexico city the capital is also the cultural center, of the country.
mexico city the capital, is also the cultural center, of the country.