( 489 + 375 )^2 - ( 489 - 375 )^2 ( 489 × 375 ) = ?

Answer: Option D

Given expression :
$$=\frac{{\left(a+b\right)}^2-{\left(a-b\right)}^2}{ab}$$     (where a = 489, b = 375)
$$\begin{array}{rl}& =\frac{4ab}{ab}\\ & =4\end{array}$$