The correct option is
B Recycle
The 'three Rs' that will help us to conserve natural resources for long-term use are reduced, recycle and reuse.
Reduce- Make use of smaller or less in amount, degree or size. For example, electricity and water.
Recycle- Convert (waste) into reusable material. For example, plastic cups and buckets, glass tumbler, paper, metal objects.
Reuse- Use again or more than once. For example, used envelopes, plastic carry bags, bottles of jam.
Thus, the correct answer is option B.