Which of the Following Statements About the Experiments of Tyrone

Which of the following statements about the experiments of Tyrone Hayes on abnormalities of male frog sex organs is correct?

A) In a set of controlled experiments, he had to reject his hypothesis that atrazine was causing abnormalities in male frogs.
B) As a result of the comparative experiments, he formed a new hypothesis that snails were causing the limb deformities in the frogs.
C) The controlled experiments compared the effects of various atrazine concentrations on reproductive tissues.
D) He reasoned, by means of inductive logic, that if atrazine caused abnormal testes development, then such deformities could be caused simply by exposing developing tadpoles to various concentrations of atrazine.
E) The abnormality rate was proportional to the level of atrazine exposure.