In environmental science class, a student learns that the 4R principle is used to protect the environment. The teacher asked a student to name the four R's in the 4R principle. The student correctly gives the name for three R's as Reduce, Reuse, and Recycle. However, the student cannot name the last R'. What does the fourth R stand for?
The 4R principle should be used to protect the environment. The four R's in the 4R principle stand for Reduce, Reuse, Recycle, and Recover. Thus, the fourth 'R' stands for Recover.
The correct answer is option c