256 × 256 - 144 × 144/112 is equal to :

Answer: Option B

Given expression
$$\begin{array}{rl}& =\frac{{\left(256\right)}^2-{\left(144\right)}^2}{112}\\ & =\frac{\left(256+144\right)\left(256-144\right)}{112}\\ & =\frac{\left(400\times 112\right)}{112}\\ & =400\end{array}$$