【单选题】

The author mentions all of the following as factors which limit the persuasiveness of the evidence suggesting a link between environmental pollutants and cancer EXCEPT
A．(A) The lack of study of the effects of pollutants on human health

B．(B) Increased diagnosis rates
C．(C) An increase in the worldwide breast cancer rate
D．(D) A decrease in the worldwide uterine cancer rate
E．(E) Geographical differences in cancer susceptibility