Which resource is renewable?

A. Coal
B. Crude Oil
C. Whale Oil
D. Natural

D. Natural gas

I searched Google under the key words "renewable energy sources" to get these possible sources:

http://en.wikipedia.org/wiki/Renewable_energy
http://www.eia.doe.gov/kids/energyfacts/sources/renewable/renewable.html
http://www.teachers.ash.org.au/jmresources/energy/renewable.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.