Choose the $INCORRECT$ statement.
- AAmong the isotopes of carbon, ${}^{13}C$ is a radioactive isotope.
- BCarbon exhibits negative oxidation states along with $+4$ and $+2$.
- CCarbon cannot exceed its covalency more than four.
- D$CO_{2}$ is the most acidic oxide among the dioxides of group $14$ elements.
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