What is required to keep a resource sustainable.

A. the consumption rate for the resource most be lower than its renewal rate

B. demand for the resource must exceed its renewal rate.

C. demand for the resource must exceed its supply

D. the renewal rate for the resource must be lower than its consumption rate

A is indeed correct

The answer is A. This ensures that the resource has enough time to regenerate so as to sustain consumption. An example is that of the carrying capacity of a habitat. If a herd of cows exceed the carrying capacity of the grazeland, the grass will be depleted and the area will be predisposed to desertification. The environment will not be able to sustain the cows anymore until the herd number reduce.