Fluoride ions make the enamel of teeth much harder by converting which of the following substances/compounds?
- A$[3 Mg_3(PO_4)_2 \cdot Ca(OH)_2]$
- B$[3 Ca_3(PO_4)_2 \cdot Ca(OH)_2]$
- C$[3 Ca_3(PO_4)_2 \cdot CaF_2]$
- D$[3 Ca_3(PO_4)_2 \cdot MgCl_2]$
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