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

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larger atomic size of actinides than the lanthanides

more energy difference between 5f and ed orbitals than between 4f and 5d-orbitals

lesser energy difference between 5f and 6d-orbitals than between 4f and 5d-orbitals

greater reactive nature of the actinides than the lanthanides

answer is A.

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Detailed Solution

We know that Actinides show larger oxidation states than lanthanides, because of the small energy gap between 5f, 6d and 7s subshells. Hence, the outermost electrons get easily excited to the higher energy levels, giving variable oxidation states.

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