New species develop when a diverging species mate exclusively. b diverging species mate with multiple members of the other species. c diverging species recognize many potential mates among both species. d diverging species no longer recognize one another as potential mates.

New species develop when:

D. Diverging species no longer recognize one another as potential mates.

Explanation:

The development of two or more new species from ancestral population is known as speciation.Speciation can occur when the population divides into groups and each group occupies a different habitat (geographic isolation)  or when the members of the same population do not find one another as potential mate and do not interbreed (reproductive isolation mechanism).The three types are: Allopatric speciation.    

                                          Sympatric speciation.

                                           Parapatric speciation.

Allopatric speciation occurs when genetic divergence is allowed through  geographic isolation.Sympatric speciation does not involve geographic isolation but involves reproductive isolation mechanisms.In Parapatric speciation, a population enters a new niche or habitat within the range of parent species and then evolution of reproductive isolation mechanism occurs.