The given scenario is correct; the molecular orbital diagram is done correctly, and since two degenerate molecular orbitals each contain a single electron, the cyclononatetraenyl anion is antiaromatic.

The given scenario is incorrect; the total number of electrons in cyclononatetraenyl anion is eight, and filling the molecular orbitals with electrons will make the cyclononatetraenyl anion aromatic.

The given scenario is incorrect; the polygon should be inverted so that one vertex is at the bottom, and filling the molecular orbitals with electrons will make the cyclononatetraenyl anion aromatic.

There is not enough information given to answer the problem.