John was in the fertilized egg business . He had several hundred young laying hens , called " pullets " , and ten roosters to fertilize the eggs . He kept records , and any rooster not performing went into the soup pot and was replaced . This took a lot of time , so he bought some tiny bells and attached them to his roosters .
Where does John work ?
Pick the best answer from the following options:
A. An in vitro fertility clinic .
B. At an animal hospital .
C. None of the above choices .
D. In agriculture .


D