( America and Americans were prosperous beyond the dreams of the Europeans and Asians whose economies the war had destroyed . ) The US achieved its predominance after World War II because ______.
A.
it had made painstaking efforts towards this goal
B.
its domestic market was eight times larger than before
C.
the war had destroyed the economies of most potential competitors
D.
the unparalleled size of its workforce had given an impetus to its economy