Which element from the following has a half-filled $f$ orbital in the $+3$ oxidation state?
- A$U (Z=92)$
- B$Lr (Z=103)$
- C$Cm (Z=96)$
- D$Th (Z=90)$
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$II$. In $Eu$ and $Yb$, lanthanoid contraction is not observed.
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