$7.$ The sustainability criterion $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$

A$.$ is the approach that makes present and future generations agree upon resource

allocation

B$.$ suggests that, at a minimum, future generations should be left no worse off

than current generations

C$.$ is not related to the concept of scarcity

D$.$ means that current generations may not under any circumstance use resources

that would therefore be denied to future generations