$\begin{array}{l}\text{In this question,}\\ \\ \text{104}-\text{21}\times \text{448}÷{\text{16+ 1013 = ?}}^{\text{2}}\\ \\ \Rightarrow \text{104 }-\text{ 21}\times {\text{28+1013 =?}}^{\text{2}}\\ \\ \Rightarrow \text{104}-{\text{588+ 1013 = ?}}^{\text{2}}\\ \\ \Rightarrow \text{529 = }{x}^2\\ \\ \Rightarrow \sqrt{x^2}=\sqrt{529}\\ \\ \Rightarrow x=23\end{array}$

Hence, Option D is correct.