Option C.
Step-by-step explanation:
The given matrix is B =
We have to find the determinant of the given matrix.
In a matrix given in the form of
Determinant of the matrix is represented by ad - bc
By this rule,
Determinant B = (-18)×1 - 3×4
= -18 - 12
= -30
Therefore, option C. -30 will be the answer.