# Lanthanides and actinides resemble in

$\begin{array}{1 1}(a)\;\text{Electronic configuration}&(b)\;\text{Ionization energy}\\(c)\;\text{Oxidation state}&(d)\;\text{Formation of complexes}\end{array}$

The oxidation state in both (lanthanide and actinide) is +3. The property of actinide are very similar to those of lanthanide when both are in +3 state
Hence (C) is the correct answer.
edited Oct 2

Oxidation state