The value of 68 - 6 × [ 4 + 4 × {12 - 4 ( 6 - 5 ) × 3} ÷ 15] is:

Correct option is D

Given:
​$$68 - 6 × [ 4 + 4 × \{12 - 4 ( 6 - 5 ) × 3\} ÷ 15]$$ 
Concept Used:​​

​$$\begin{array}{|c|c|} \hline \textbf{Operation preference wise} & \textbf{Symbol} \\ \hline Brackets &[],{}, () \\ \hline Orders, of & ² (power), √ (root) , of \\ \hline Division & ÷ \\ \hline Multiplication & × \\ \hline Addition & + \\ \hline Subtraction & - \\ \hline \end{array}$$

​Solution:​

​68 - 6 × [ 4 + 4 × {12 - 4 ( 6 - 5 ) × 3} ÷ 15] 
= 68 - 6 × [ 4 + 4 × {12 - 4 $$\times$$​ 1 × 3} ÷ 15] 
= 68 - 6 × [ 4 + 4 × {12 - 12} ÷ 15] 
= 68 - 6 × [ 4 + 4 × 0 ÷ 15] 
= 68 - 6 × [ 4 ] 
= 68 - 24
= 44