The three R's which can help us to conserve natural resources for long-term use are:
(a) recycle, regenerate, reuse
(b) reduce, regenerate, reuse
(c) reduce, reuse, redistribute
(d) reduce, recycle, reuse
(d) reduce, recycle, reuse
The three R's, i.e. reduce, recycle, reuse can help us to conserve natural resources for a long-term use.