b is the answer

Which is the best description of bedrock

A. Dark soil, rich in humus
B. Coarse soil with little humus
C. Decaying plant and animal matter
D. Solid rock with some cracks

d

Since this is not my area of expertise, I searched Google under the key words "bedrock" to get these possible sources:

http://en.wikipedia.org/wiki/Bedrock
http://glossary.eea.europa.eu/EEAGlossary/B/bedrock
http://www.glossary.oilfield.slb.com/Display.cfm?Term=bedrock
http://nsidc.colorado.edu/cgi-bin/words/word.pl?bedrock

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.