In which of the following ways is natural selection not analogous to artificial selection?

(a) Natural selection depends upon the presence of variation, artificial selection does not.

(b) Natural selection occurs within populations, artificial selection does not.

(c) With natural selection 'picking' is due to the fit of an organism with its environment whereas in artificial selection, the breeder ,picks, which organisms will breed.

(d) There is a limit to how much change can be brought about by natural selection, no such limit exists for artificial selection.