Group $13$ elements show $+1$ and $+3$ oxidation states. The relative stability of the $+3$ oxidation state is given by:
- A$Tl^{3+} > In^{3+} > Ga^{3+} > Al^{3+} > B^{3+}$
- B$B^{3+} > Al^{3+} > Ga^{3+} > In^{3+} > Tl^{3+}$
- C$Al^{3+} > Ga^{3+} > Tl^{3+} > In^{3+} > B^{3+}$
- D$Al^{3+} > B^{3+} > Ga^{3+} > Tl^{3+} > In^{3+}$
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