Which metal nitrate solution is coloured?

A.     ${\text{Zn(N}}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}{\text{(aq)}}$

B.     ${\text{Ni(N}}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}{\text{(aq)}}$

C.     ${\text{Mg(N}}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}{\text{(aq)}}$

D.     ${\text{Sc(N}}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{3}}}{\text{(aq)}}$

B