Which of the following would BEST describe native people's approach to the varied and sometimes harsh environments in which they lived?
(A) They developed societies and cultures that adapted to the resources that were available.
(B) They developed societies and cultures that depended on a stable way of farming and hunting.
(C) They became much more nomadic and moved around the continent as the weather changed.
(D) They became much more sedentary as the years passed and all built large permanent settlements.