Read the Scenario and Answer the Accompanying Questions

Read the scenario and answer the accompanying questions.
Many important life-sustaining resources and ecosystem services are predicted to become scarcer in the next 50 years. Two of the best-known examples of this trend involve water and oil consumption. Although a daily dependence on both is a fact of human existence in the 21st century, these resources differ in very basic ways: renewability. Although not the only effective approach, increased conservation is recommended as a central focus for managing both resources, in order to accelerate the transition to a more sustainable future.
-The primary reason for a conservation approach for remaining oil reserves is _______.

A) the ever- increasing higher costs of oil
B) developing countries are using less, making a greater resource available for the industrialized nations
C) the rate at which we are extracting oil is thousands of times faster than the rate of its formation
D) industry is taking an ever- increasing share of these resources
E) these resources are very hard to mine