Which of the following scenarios reflects sustainability?

A. A beef and vegetable farmer has begun collecting rainwater to give to his animals and use on his crops.
B. The owner of an orchard was able to get twice the amount of fruit to market after instructing his day laborers to take only ten minutes
for lunch.
C. The factory owner of a wheat-processing plant has been slow to implement changes to improve smokestack emissions.
D. An automobile manufacturer continues marketing his line of large automobiles after a newly found source of oil is estimated to last
one hundred years.