NO.PZ2015122802000123
问题如下：
A sector rotation strategy involves investing in a sector by:
选项：
A.making regular investments in it.
B.investing in a pre-selected group of sectors on a rotating basis.
C.timing investment to take advantage of business-cycle conditions.
解释：
C is correct.
A sector rotation strategy is conducted by investors wishing to time investment in industries through an analysis of fundamentals and/or business-cycle conditions.
考点：Classification of Industry
行业轮转策略就指的是根据基本面和经济周期的分析做出及时的投资，简单来说如果能判断好目前所处的经济周期的位置，然后选择适当的行业进行投资并获利的策略。
看了之前的回答，说是凑选项的，但还是不懂是什么原因B不对，麻烦给解析下
