The 'Reduce', 'Reuse' and '____' elements are the '3 R's' to save the environment.

The 'Reduce', 'Reuse' and '____' elements are the '3 R's' to save the environment.

The 'Reduce', 'Reuse' and '____' elements are the '3 R's' to save the environment.

• Reverb
• Repeat
• Retreat
• Recycle

ANSWER 

     (4)

• Recycle