The three Rs used for the mitigation of solid wastes are

The three Rs of solid-waste mitigation are reduce, reuse and recycle.

Statement 1, recover, is a valid waste strategy but not one of the classic three Rs.

Statement 2, reduce, cuts waste generation and is the first R.

Statement 3, reuse, extends product life and is the second R.

Statement 4, restrict, is not part of the three-R framework.

Statement 5, recycle, reprocesses materials and is the third R.

Reduce ranks highest, as preventing waste beats managing it later.