The Range of the Grizzly Bear in the 48 Contiguous

The range of the grizzly bear in the 48 contiguous United States is now less than 1% of what it was in 1800.What has been proposed to help maintain genetic variation in the remaining populations of this species?

A) protected corridors between all of the remaining populations
B) regular exchange of bears between isolated populations
C) preserving more small patches of forest
D) cloning of the most genetically diverse remaining females
E) establishment of new parks in Colorado and New Mexico