When Male Marine Toads (Bufo Marinus) Were Allowed to Clasp

When male marine toads (Bufo marinus) were allowed to clasp females for either zero, one, two, or three hours, concentrations of androgens increased with the number of hours spent in amplexus. The rise in androgens during amplexus suggests that

A) the females had selected the males based on their hormonal status.
B) the increase in hormones induced the mating behavior.
C) the males were attempting to mate with the wrong species of female.
D) the mating behavior induced the hormonal response.