The maximum number of possible oxidation states of actinoids are shown by
(a)	Berkelium (Bk) and californium (Cf)	(b)	Neptunium (Np) and plutonium (Pu)
(c)	Actinium (Ac) and thorium (Th)	(d)	Nobelium (No) and lawrencium (Lr)

  Actinodes                                                Oxidation state  shown(Np and Pu)

     Th                                                                                            +4

      Ac                                                                                            +3

      Pu                                                                              +3, +4, +5, +6, +7

      Np                                                                              +3, +4, +5, +6, +7

      Bk                                                                                            +3, +4

      Cm                                                                                            +3, +4

       Lr                                                                                                  +3

∴  Maximum oxidation state is shown by the (Np and Pu)