Frequent exposure to low-frequency electrical fields is associated with cancer. Although those fields are far too weak by themselves to produce the genetic changes that typically promote cancer, they are known to suppress the production of a hormone that prevents overproduction of the hormone estrogen. Excess estrogen is known to promote cancer.
The statements above are structured to lead to the hypothesis that
A. genetic changes are more likely to promote cancer than is any other single factor
B. most people are not exposed to electrical fields that are strong enough to produce cancer
C. exposure to low-frequency electrical fields might cause cancer through hormonal changes
D. most hormones, when produced in excess amounts, promote cancer
E. excess estrogen is likely to promote cancer only if it is accompanied by frequent exposure to low-frequency electrical fields
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