More number of oxidation states are exhibited by the actinoids than by the lanthonoids. The main reason for this is:-

Question

( A ) Greater metallic character of the lanthanoids than that of the corresponding actinoids
( B ) Lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
( C ) More active nature of the actinoids
( D ) More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals