Answer: C. Put the two groups in different environment.
Step-by-step explanation:
Speciation is the process in which new species develop from the parent or pre-existing species in due course of evolution. The following are the types of speciation.
1. Allopatric speciation: This results when the two populations of the same species, are separated geographically.
2. Sympatric speciation: This results when the two populations living in the same area diverge due to changes in the behavior, morphology and in genomic level. This results in reproductive isolation among members of the same species belonging to two distinct populations.
Among the options given, C. Put the two groups in different environment. is the correct option. This is because of the fact that this will favor allopatric speciation. As due to geographical barrier, the separated groups will develop traits different from the parent species. Hence, result in development of new species.