According to Robert Gordon (1969,1999),the Extraordinary Expansion of Physical Production

According to Robert Gordon (1969,1999) ,the extraordinary expansion of physical production in 1942-45 was achieved by

A) massive government investment in new plants and equipment.
B) finally bringing into production manufacturing plants and equipment that had been idle ?since the early 1930s so that big government investment was not necessary.
C) the Federal Reserve's peg on the bond market, which enrolled the private sector to ?mobilize the necessary capital to invest in new plant and equipment.
D) none of the above.