![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Which statement do the researchers think is wrong?
A.
They know how a tumor is developed.
B.
They know now a new tumor is seeded in the body.
C.
They know how the female hormone estrogen makes breast cancer cells grow.
D.
They know breast cancer is a death sentence to women.