Which Effort to Preserve Biodiversity Would Be Classified as Restoration

Which effort to preserve biodiversity would be classified as restoration ecology?

A) A project to convert ranch land into a natural prairie
B) A campaign to discourage pesticide use on lawns
C) Designation of the habitat of an endangered species as a protected area
D) Elimination of commercial trade in products derived from endangered species
E) A captive breeding program to maintain an endangered species