According to molecular orbital theory, which of the following is true with respect to ${\mathrm{Li}}_2^{+}$ and ${\mathrm{Li}}_2^{-}$?

According to molecular orbital theory,
The stability of a molecule depends on how many electrons are in its bonding orbitals compared to its antibonding electrons. If there are more bonding electrons than antibonding electrons, the molecule is stable; if there are fewer, it is unstable.
Both ${\mathrm{Li}}_2^{+}$ and ${\mathrm{Li}}_2^{-}$has 0.5 bond order and hence both are stable.

Hence, the correct option is (D)