A large population of wildcats is broken up into several small groups as a result of geogrpahic isolation over a long period of time these groups will most likely become

The correct answer is - reproductively isolated.

Explanation:

Reproductively isolated organisms are the organisms that are occurred due to the split in two or more small groups as a result of geographical isolation over a longer time period from a single large group by process of natural evolution.

In the given case of wildcats which is splits into several small groups due to geographical isolation over a long period of time these groups of wildcats become reproductively isolated.