The most common oxidation state of Lanthanoid elements is $+3$. Which of the following is likely to deviate easily from $+3$ oxidation state?
- A$Ce$ (At. No. $58$)
- B$La$ (At. No. $57$)
- C$Lu$ (At. No. $71$)
- D$Gd$ (At. No. $64$)
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