![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Which statement can be supported by Heather Dickinson and Louise Parker's new findings?
A.
Radiation has contributed to the disease.
B.
Putting a lot of people from rural area in a large town increases the risk of childhood leukemia.
C.
Population mixing is the most important reason for leukemia cluster.
D.
Childhood leukemia is caused by an unusual infection.