![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
The employee health study on PFOA conducted by DuPont revealed______.
A.
a certain degree of relation between exposure to PFOA and health
B.
possible damage done by PFOA exposure to health
C.
close ties between exposure to PFOA and health
D.
most of the health parameters are unaffected by PFOA exposure