Given that A = [[2, 3], [1, 4]], find the determinant of A.

The determinant of a 2×2 matrix [[a, b], [c, d]] is ad - bc. Here, det(A) = (2)(4) - (3)(1) = 8 - 3 = 5. Options B, C, and D result from common arithmetic errors such as adding instead of subtracting or using wrong entries.