The actinides exhibit more number of oxidation states in general than the lanthanide, because..........
(A) The 5f-orbitals are more spread in place than the 4f orbitals.
(B) Energy differnce between 5f and 6d orbitals is less than that of 4f and 5d orbitals.
(C) Energy difference between 5f and 6d orbital is more than that of 4f and 5d orbitals.
(D) Actinides are more reactive than that of lanthanides.
