Actinoids in general show more oxidation states than the lanthanoids. The main reason for this is
A. higher energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
B. lower energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
C. higher reactivity of actinoids than lanthanoids
D. actinoids are more basic than lanthanoids.
