(B) $EDTA$ (Ethylenediaminetetraacetate) is a hexadentate ligand. It occupies all $6$ coordination sites of the central metal ion to form an octahedra

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(B) $EDTA$ (Ethylenediaminetetraacetate) is a hexadentate ligand. It occupies all $6$ coordination sites of the central metal ion to form an octahedral complex. Therefore,only $1$ molecule of $EDTA$ is required to form an octahedral complex with a $Ca^{2+}$ ion.