![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Before the experiment ______.
A.
the four divisions were carefully selected to suit a specific programme.
B.
each division was told to reduce its level of productivity.
C.
the staff involved spent a number of months preparing for the study.
D.
the employees were questioned about their feelings towards the study.