The correct option is A Kidney
The Bidder's canal is found in the kidney of male frog and it helps in the transfer of sperms via the vasa efferentia. Vasa efferentia open into the Bidder's canal, the Bidder's canal is connected to longitudinal collecting tubules by means of a number of transverse collecting tubes and these longitudinal collecting tubules open into the ureter.
So, the correct answer is option A.