America has succeeded in shaping world events over the past 40 years probably because ofA．

America has succeeded in shaping world events over the past 40 years probably because of

A．its ability to adapt technology.

B．its ability to take advantage of the capabilities of its people.

C．its ability to compete in the world markets.

D．both A and b.

请帮忙给出正确答案和分析，谢谢！