If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark (?) in the following equation?

46 A 2 C 21 D 8 B 3 = ?

Given: 46 A 2 C 21 D 8 B 3 = ?

Using BODMAS rule.

​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline\end{array}$$

New equation: ​​46 ÷ 2 + 21 - 8 × 3 = ?

23 + 21 - 8 × 3 = ?

23 + 21 - 24 = ?

44 - 24 = ?

? = 20

Thus, correct option is (b).