The answer is D. 188.

All the other numbers are the product of two consecutive numbers.

380 = 19 * 20 188 = 17 * 11 92 = 18 * 5 48 = 16 * 3 20 = 19 * 1 8 = 7 * 1 2 = 1 * 2

188 is not the product of two consecutive numbers.