Which of the following statements is wrong for the transition elements?

Transition elements starts from 4th period as they have valence shell configuration $(n-1)d^{1-10}{\mathrm{ns}}^{0-2}$

Transition metals are not generally diamagnetic Infect most of the transition metals are paramagnetic or ferromagnetic. It is due to the presence of unpaired electrons in their atoms/ions. 

Hence, the option A is correct.