The examples of green and sustainable designs given in paragraph 2 show that ( ).

A、designsmustbesustainableinorderforthemtobedescribedasgreen.
B、forthepurposesofthispaper,thetermsgreenandsustainablehavethesamemeaning.
C、somesustainabledesignsaregreen,whileothersarenot.
D、somedesignsaretermedgreen,eventhoughtheyarenotsustainable.