Which shows these World War II events in the correct chronological order?

A.
Allies invade Normandy; Germany invades Soviet Union; Potsdam Conference

B.
Potsdam Conference; Germany invades Soviet Union; Allies invade Normandy

C.
Germany invades Soviet Union; Allies invade Normandy; Potsdam Conference

D.
Allies invade Normandy; Potsdam Conference; Germany invades Soviet Union