Actinides exhibit larger number of oxidation state than that of corresponding lanthanides. The reason behind this aspect is

• A. lesser energy difference between 5f and 6d-orbitals than between 4f and 5d-orbitals
• B. larger atomic size of actinides than the lanthanides
• C. more energy difference between 5f and 6d orbitals than between 4f and 5d-orbitals
• D. greater reactive nature of the actinides than the lanthanides