Which of the following statements best describes a limitation of the biological species concept?

A) The biological species concept cannot be applied to fossils because the biological species concept uses reproductive isolation to define species.
B) The biological species concept cannot be applied to haploid species because the biological species concept delineates species by the presence of gene flow between species.
C) The biological species concept cannot be applied to polyploid species because the biological species concept separates species by the absence of gene flow between them.
D) The biological species concept cannot be applied to sexual species because the biological species concept separates species by the absence of gene flow between species.