Normally a bone becomes fossilized through the action of groundwater, which permeates the bone, washes away its organic components, and replaces them with minerals.
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Awhich permeates the bone, washes away its organic components, and replaces them
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Bwhich permeates the bone, washes away its organic components, and those are replaced
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Cwhich permeates the bone, washing away its organic components, to be replaced
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Dpermeating the bone, washing away its organic components, to be replaced
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Epermeating the bone, washing away its organic components and replacing them
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