问题如下：
Which of the following statements about real business cycle theory is correct?
选项：
A.It states that business cycle is driven by changes in economic factors such as technology.
B.It states that business cycle is the response to business managers’ optimism and pessimism.
C.It states that business cycle is the result from the change of money supply growth rate.
解释：
A is correct. Real business cycle theory believes business cycle is temporary and driven by changes in economic factors such as technology. Keynesian economists believe that business cycle is the response to business managers’ optimism and pessimism. Monetarist believe that business cycle is the result from the inappropriate changes of money supply growth rate.
考点： real business cycle theory
解析：真实商业周期理论认为商业周期是暂时的，由技术等经济因素的变化驱动。A选项正确。
凯恩斯主义经济学家认为，商业周期是对企业管理者的乐观和悲观情绪的反应。B选项错误
货币主义者认为，商业周期是货币供应量增长率变化不当的结果。C选项错误。
real business cycle theory是哪个学派的?
