(A) : Zinc is not considered as a transition element(R) :Neither Zn nor Zn+2  ion does not contain unpaired d-electrons

Elements which contain incompletely filled nth shell and (n-1)th shell in their atoms (or) in their most common oxidation state (+2) are called transition elements;Zn (Z=30)....Ar4s23d10Zn+2..Ar3d10Zn and Zn+2 have completely filled 3d10 configuration.Thus Zn is not a transition element.