Respuesta :
D.Mexico’s full name is the United Mexican States, and it is known as, Estados Unidos Mexicanos in Spanish. is the correct way
The answer which shows proper comma usage is option A. "Mexico’s full name is the United Mexican States, and it is known as Estados Unidos Mexicanos in Spanish."
A comma should be use:
before any coordinating conjunction (and, but, for, or, nor, so, yet) that links two independent clauses;
after a dependent clause that starts a sentence;
to offset appositives from the rest of the sentence,
to separate items in a series,
after introductory adverbs,
when attributing quotes,
o separate the elements in a full date (weekday, month and day, and year). Also separate a combination of those elements from the rest of the sentence with commas.