According to molecular orbital theory, which of the following is correct?

12 electrons make up the ${\mathrm{C}}_2$ molecule. Its atomic orbital diagram is as follows:

$\left(\right({\sigma }_{1}s{)}^2\left({\sigma }_1{s}^{*}{)}^2\right({\sigma }_{2}s{)}^2\left({\sigma }_2{s}^{*}{)}^2\right({\Pi }_{2}px{\left)}_{\right(}\left({\sigma }_{2}p\right){)}^2@\left({\Pi }_{2}p4{)}^2\right)$

$C_2:KK\left({\sigma }_{2}s{)}^2\right({\sigma }_{2}s{)}^2(\pi 2p_y=\pi 2p_z{)}^4({\sigma }_{(}2p_x\left)\right)\Rightarrow LUMO$

The least-occupied molecular orbital (LUMO) is used here. For ${\mathrm{C}}_{2 }\mathrm{LUMO}$ is ${\sigma }_{2}px$.