Which of the following is an appropriate method of land-use control? 

A)  subsidizing of farmers who use marginal land that is highly susceptible to erosion 
B)  providing tax breaks for owners to develop open space 
C)  developing existing open space 
D)  implementing conservation easements

Implementing conservation easements is an appropriate method of land-use control as it involves a legal agreement between a landowner and a government agency or nonprofit organization that restricts certain types of development or land use in order to protect specific conservation values or natural resources. This can help to conserve open space, protect wildlife habitats, and maintain biodiversity without completely restricting land use. Subsidizing farmers who use marginal land that is highly susceptible to erosion may incentivize unsustainable land use practices, while providing tax breaks for owners to develop open space or developing existing open space may contribute to urban sprawl, loss of green space, and further fragmentation of natural areas.