Atomic orbitals of carbon in carbon dioxide are:

The correct option is C $\text{sp}$-hybridised
$C_{excitedstate}=2s^{1}2p_x^1{p}_y^1{p}_z^1$
$O_{groundstate}=2s^{2}2p_x^2{p}_y^1{p}_z^1$

In the formation of $C{O}_2$ molecule, hybridization of orbitals of carbon occurs only to a limited extent involving only one $s$ and one $p$ orbital to give rise $SP$ type of hybridization.

So the correct option is $\left[C\right]$.