The word "depleted" (Line 1, Para. 1) possibly means"________".

A．Energy crisis.
B．Water as a possible solution to energy crisis.
C．History of the use of water as a source of work energy.
D．Properties of water.

A．was an old phenomenon in the disguise of a new cloak
B．indicated a turn of people's attention to the quality of life
C．began to be noticed in the industrialized world during the '50s and '60s
D．was less visible because people didn't want to be accused of resisting the tradition