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h = 3a + 28.6 A pediatrician uses the model above to estimate the height b of a boy, in inches, in terms of the boy's age a, in years, between the ages of 2 and 5. Based on the model, what is the estimated increase, in inches, of a boy's height each year?

1. A 10
2. B 3
3. C 5
4. D 7.5