Read each passage carefully and answer the questions that follow it
All over the world till lately, and in most of the world still today, mankind has been following the course of nature, that is to say, it has been breeding up to the maximum. To let nature take her extravagant course in the reproduction of the human race may have made sense in an age in which we were also letting her take her course in decimating mankind by the casualties of war, pestilence and famine. Being human, we have at last revolted against that senseless waste. We started to impose on heartless play a humane new order of our own. But, when once man has begun to interfere with nature, he cannot afford to stop half way. We cannot, with impunity, cut down the death-rate and at the same time allow the birth-rate to go on taking course. we must consciously try to establish an equilibrium or, sooner or later, famine will stalk abroad again
'we must consciously try to establish an equilibrium, (line 8)implies that mankind must
A. realistically find an equation B. strive not to be wasteful C. delibrately try to fight nature D. try to fight nature E. purposely find a balance
