In each question, a sentence is written in four different ways. Choose the option which gives the most effective and grammatically correct sentence. Pay attention to grammar, word choice and sentence construction.

A. He must again learn to invoke the energy of growing things and to recognize, that one can be taking from the earth and the atmosphere only so much as one puts back into them, as did the ancient in India centuries ago.

B. As did the ancient in India centuries ago, he must again learn to invoke the energy of growing things and to recognize that one can take from the earth and the atmosphere, only so much as they put into them.

C. He must again learn to invoke the energy of growing things and to recognize, as did the ancient in India centuries ago, that one can take from the earth and the atmosphere, only so much as one puts back into them.

D. He must again learn, as did the ancient in India centuries ago, to invoke the energy of growing things and to recognize, that one can be taking from the earth and the atmosphere, only so much as one puts back into them.