Directions: Given below are six sentences, out of which sentences A and F are in the correct position. Sentences B, C, D and E are in a jumbled order. Select the option that gives the correct order.

A. The machines that drive modern civilization derive their power from coal and oil.

B. A time may come when some other sources have to be tapped and utilized.

C. Power may, of course, be obtained in the future from forests, water, mind, and withered vegetables.

D. These sources may not be exhausted very soon.

E. But they are not inexhaustible.

F. Nuclear Energy may also be effectively used in this respect.