(1 point) A and B are n x n matrices. Check the true statements below: A. Adding a multiple of one row to another does not affect the determinant of a matrix. B. The determinant of A is the product of the pivots in any echelon form U of A, multiplied by (-1)", where r is the number of row interchanges made during row reduction from A to U. C. If the columns of A are linearly dependent, then det A = 0. D. det(A + B) = det A + detB.