Select the sentence that is complete and properly punctuated.
A.
Americans eat an average of three hamburgers a week the total number sold by​ McDonald's alone is equivalent to twelve hamburgers for every person in the world.
B.
Americans eat an average of three hamburgers a​ week, the total number sold by​ McDonald's alone is equivalent of twelve hamburgers for every person in the world.
C.
​Americans, who eat an average of three hamburgers a week.
D.
Americans eat an average of three hamburgers a​ week; the total number sold by​ McDonald's alone is equivalent to twelve hamburgers for every person in the world.