In a complexometric titration of metal ion with ligand M (Metal ion) + L (Ligand)  C(Complex) end point is estimated spectrophotometrically (through light absorption). If ‘M’ and ‘C’ do not absorb light and only ‘L’ absorbs, then the titration plot between absorbed light (A) versus volume of ligand ‘L’ (V) would look like

Only the ligand is absorbing light in the complexometric titration between the metal and ligand to create the complex. As a result, the amount of ligand in the solution will directly proportionate to the amount of light absorbed. Due to the development of the complex, the metal initially consumes the ligand. So the light that is absorbed doesn't change. As soon as the compound is formed, the amount of ligand in the solution grows, increasing the amount of light that is absorbed.

Hence, the correct option is option (B)