Which events mark the start and end of the World War II era?
O
A. The Soviet Union launches Sputnik, the Soviet Union collapses.
O
B. The U.S. battleship Maine sinks; the United States gains control of
Cuba.
O
C. Archduke Franz Ferdinand is assassinated; the United States joins
the war in Europe.
O
D. Germany invades Poland; the United States uses atomic bombs.