Airmail Express charges for shipping small packages by integer values of weight. The charges for a weight w in pounds are as follows:
 0 < w ≤ 2 $4.00
 2 < w ≤ 5 $8.00
 5 < w ≤ 20 $15.00
 The company does not accept packages that weigh more than 20 pounds. Which of the following represents the best set of data (weights) to test a program that calculates shipping charges?
(A)0, 2, 5, 20 (B)1, 4, 16 (C)−1, 1, 2, 3, 5, 16, 20 (D)−1, 0, 1, 2, 3, 5, 16, 20, 22
D