Eva makes a few dozen cupcakes and sells them for $8 a dozen. Which function represents the relationship between the money Eva earns, m, and the number of cupcakes she sells, c? A. f(c) = c × 8. B. f(m) = c × 8. C. f(c) = m × 8. D. f(m) = m × 8. E. f(m) = c × m