Which of the following transitions involve' maximum amount of energy?

• A

  ${\mathrm{M}}_{\left(\mathrm{g}\right)}^{\ominus }⟶{\mathrm{M}}_{\left(\mathrm{g}\right)}$

• B

  ${\mathrm{M}}_{\left(\mathrm{g}\right)}^{\ominus }⟶{\mathrm{M}}_{\left(\mathrm{g}\right)}^{\oplus }$

• C

  ${\mathrm{M}}_{\left(\mathrm{g}\right)}^{\oplus }⟶{\mathrm{M}}_{\left(\mathrm{g}\right)}^{2+}$

• D

  ${{\mathrm{M}}^{2+}}_{\left(\mathrm{g}\right)}⟶{{\mathrm{M}}^{3+}}_{\left(\mathrm{g}\right)}$