The correct statement is

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(B) The most stable oxidation state for lanthanoids is $+3$. $Ce^{4+}$ is a strong oxidizing agent in aqueous solution because it easily gains an elec

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$Ce^{4+}$ in aqueous solution is not known.

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(B) The most stable oxidation state for lanthanoids is $+3$. $Ce^{4+}$ is a strong oxidizing agent in aqueous solution because it easily gains an electron to form the more stable $Ce^{3+}$ ion. Therefore,$Ce^{4+}$ is not stable in aqueous solution and is not known to exist as a free ion in such conditions. Thus,the statement '$Ce^{4+}$ in aqueous solution is not known' is considered correct in the context of its stability.

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