Allopatric speciation is the formation of species due to geographical barriers like continental drift, origin of mountain, origin of ocean, etc and such type of speciation is called allopatric speciation
In case of the given species of fish they were split by the formation of the isthmus of Panama a long time ago as a result fish developed changes in their genes to adapt to the change in environmental conditions hence resulted into two different species which clearly represents allopatric speciation
The answer is most definitely A! bears thrive in a certain environment so if you were to cut it down, it might wipe out a major food source for the bears and kill them off!