Which sentence is punctuated correctly?


A.

My father has studied these languages: Russian; German; and Arabic.


B.

On their vacation trip to Europe, the Richardsons visited Vienna, Austria; Munich, Germany; and Warsaw, Poland.


C.

The dates of the big conventions are May 18-20; July 13-15; and August 17-19.


D.

James City County; Virginia, St. Mary's County; Maryland, and York County; Maine are some of the oldest counties in the United States.