How is the variability in oxidation states of transition metals different from that of the non-transition metals?

Options

1. ATransition metals generally have fewer oxidation states compared to non-transition metals.
2. BIn transition elements the oxidation states vary by unity whereas In non-transition element, this variation is
3. CNon-transition metals have partially filled d-orbitals unlike transition elements
4. DNon-transition metals can easily form coordination complexes unlike transition elements