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Lanthanide contraction is caused due to............

(A) The appreciable shilding on outer electrons by 4f electrons from the nuclear charge. 

(B) The appreciable shilding on outer electrons by 5d electrons from the nuclear charge. 

(C) The same effective nuclear charge from Ce to Lu. 

(D) The poor shilding on outer electrons by 4f electrons from the nucluear charge. 

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(D) The poor shilding on outer electrons by 4f electrons from the nucluear charge.

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