Inorganic compounds are simple compounds and differ in composition from organic. The earth's crust is not a reservoir of inorganic compounds. Thus, option b is correct.
Inorganic carbon compounds have a different composition than that organic compounds and have nitrogen, oxygen, sulfur, etc. attached to the carbon atom.
It is found abundantly in oceans, trees, and the atmosphere, but not abundantly in the crust of the earth. Oceans, sediments, and fossil fuels are sources of carbon.
Therefore, option b. earth's crust is not a reservoir of inorganic carbon.
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