Consider all $2 \times 2$ matrices whose entries are distinct and taken from the set $\{ 1,2,3,4 \}$. The sum of determinants of all such matrices is (A) 24 . (B) 10 . (C) 12 . (D) 0 .
Consider all $2 \times 2$ matrices whose entries are distinct and taken from the set $\{ 1,2,3,4 \}$. The sum of determinants of all such matrices is\\
(A) 24 .\\
(B) 10 .\\
(C) 12 .\\
(D) 0 .