(B) The most common and stable oxidation state for all lanthanoid elements is $+3$. Although some lanthanoids exhibit $+2$ or $+4$ oxidation states in

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(B) The most common and stable oxidation state for all lanthanoid elements is $+3$. Although some lanthanoids exhibit $+2$ or $+4$ oxidation states in specific compounds,the $+3$ state is characteristic of the entire series due to the stability provided by the electronic configuration.