Which sentence correctly uses commas to separate items in a list? The Library of Congress is home to the world's most extensive
comic-book collection, oldest original newspaper collection and, most abundant collection of cartographic items. The Library of Congress is home to the world's most extensive comic-book collection oldest original newspaper collection and most abundant collection of cartographic items. The Library of Congress is home to the world's most extensive comic-book collection, oldest original newspaper collection, and most abundant collection of cartographic items. The Library of Congress is home to the world's most extensive comic-book collection, oldest original newspaper collection and most abundant collection of cartographic items.
The Library of Congress is home to the world's most extensive comic book collection, oldest original newspaper collection, and most abundant collection of cartographic items.
The third sentence is correct.
You always put a comma after each statement, and then before the and in the last.