The answer is D. This is the answer because it has a meaning behind the words. The other are meaningless. Hope this helps!!!
The second line implies it all.
Reduce, Reuse, Recycle. ...
Use Less Heat and Air Conditioning. ...
Replace Your Light Bulbs. ...
Drive Less and Drive Smart. ...
Buy Energy-Efficient Products. ...
Use Less Hot Water. ...
Use the "Off" Switch. ...
Plant a Tree.
