Sentence Correction (SC) | Re: Normally a bone becomes fossilized through the action of groundwater

had the option C] be like:

''Usually, a bone becomes fossilized through the action of groundwater,
which permeates the bone and washes away its organic components to be replaced with minerals''

Here, '' to be replaced'' is an adverbial modifer modifying ''why groundwater washes away its organic components?''

please correct myunderstanding.