Staggering tasks confronted the people of the United States, North and South, when the Civil War ended. About a million and a half soldiers from both sides had to be demobilized, readjusted to civilian life, and reabsorbed by the devastated economy.
The word "Staggering" is closest in meaning to which of following?
(A) specialized
(B) confusing
(C) various
(D) overwhelming
正确答案：D
