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Versene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:

(a) 100 mg

(b) 163 mg

(c) 200 mg

(d) 263 mg