Which one of the following is a 'd - block element '

d- block elements have incompletely filled d- orbitals in their ground state or in any of their oxidation states. The general electronic configuration of d - block elements is (n−1)d1−10ns1−2 Depending on (n -1) values, there are 3d,4d,5d and 6d series of transition elements. Hs(Z = 108) [Hassium] belongs to 6d series with electronic configuration - [Rn]5f146d67s2.