Which of the following relations describes a function? A. { (0, 0), (0, 2), (2, 0), (2, 2) }
B. { (2, 2), (2, 3), (3, 2), (3, 3) }
C. { (2, -1), (2, 1), (3, -1), (3, 1) }
D. { (-2, -3), (-3, -2), (2, 3), (3, 2) }

Here are the 30 best lifetime baseball batting averages of all time, arranged in order from lowest to highest: 0.319, 0.329, 0.330, 0.331, 0.331, 0.333, 0.333, 0.333, 0.334, 0.334, 0.334, 0.336, 0.337, 0.338, 0.338, 0.338, 0.340, 0.340, 0.341, 0.341, 0.342, 0.342, 0.342, 0.344, 0.344, 0.345, 0.346, 0.349, 0.358, 0.366 if you were to build a histogram of these data, which of the following would be the best choice of classes?