# The reason for greater range of oxidation states in actinoids is attributed to

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The reason for greater range of oxidation states in actinoids is attributed to

(a) actinoid contraction

(b) $5f$, $6d$ and $7s$ levels having comparable energies

(c) $4f$ and $5d$ levels being close in energies

(d) the radioactive nature of actinoids.