Which one of the following complexes will most likely absorb visible light ? (At nos. Sc=21,Ti=22,V=23,Zn=30)

Question

$(a)\;[Sc(H_{2}O)_{6}]^{3+} \qquad(b)\;[Ti(NH_{3})_{6}]^{4+} \qquad(c)\;[V(NH_{3})_{6}]^{3+} \qquad(d)\;[Zn(NH_{3})_{6}]^{2+} $