According to the Biological Species Concept, the Study of Speciation

According to the biological species concept, the study of speciation is equivalent to

A) the study of gene flow between non-diverging lineages.
B) the study of the evolution of reproductive isolating barriers.
C) the study of heritable phenotypic traits by exchanging alleles.
D) the study of characteristic differences in heritable genotypes.
E) the study of preferential sexual selection in a non-randomly mating population.