The process of recycling

/in /by

The process of recycling
I. requires more energy than either reducing or reusing materials.
II. is used primarily to decrease the amount of waste heading to landfills.
III. is often inefficiently carried out and costly.

 a

 

I and III

 

 b

 

II and III

 

 c

 

I and II

 

 d

 

I, II, and III