The Ngorongoro Conservation Area Is an Example of ____

The Ngorongoro Conservation Area is an example of ____.

A) conservation through preservation, with people completely excluded
B) conservation through preservation, with people allowed only as temporary visitors
C) mixed use conservation, with some human residents and livestock grazing
D) mixed use conservation, with no human residents and limited livestock grazing
E) conservation through restoration, with efforts to remove contaminants underway