You should try to limit the use of natural resources. They are running out in many tourist destinations.

A. You should try to limit the use of natural resources unless they are running out in many tourist destinations.

B. Because you try to limit the use of natural resources, they are running out in many tourist destinations.

C. You should try to limit the use of natural resources, so they are running out in many tourist destinations.

D. Natural resources are running out in many tourist destinations, so you should try to limit their use.