The ions which contain unpaired electrons exhibit paramagnetic behavior. The electronic configuration of the ions are given below: Ti3+=1s22s22p63s23p5 Cu2+=1s22s22p63s23p53d9 Mn3+=1s22s22p63s23p53d4 Thus, all of them have unpaired electrons. Hence, they will show paramagnetic behavior. In option (B) V3+ does not possess any unpaired electrons. In option(C) Zn2+ does not possess any unpaired electrons. Similarly in option (D) Zn2+ does not possess any unpaired electrons.