Which expression represents the determinant of cap A is equal to the 2 by 2 matrix row 1, 2 3 row 2, 1 9 ?
A
det times cap A is equal to 2 times 9 plus 1 times 3B
det times cap A is equal to 2 times 3 plus 1 times 9C
det times cap A is equal to 2 times 9 minus 1 times 3D
det times cap A is equal to 2 times 3 minus 1 times 9