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The canthanide contraction is responsible for the fact that .................

(A) Zn and Zr have the same oxidation state. 

(B) Zr and Hf have same covalent and ionic radius. 

(C) Zr and Nb have same oxidation state. 

(D) Zr and Yb have same covalent and ionic radius.

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(B) Zr and Hf have same covalent and ionic radius.

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