In which choice is y a nonlinear function of x?

O A. XO 2 4 6 8

y 24 18 1260

O B. X0 2 4 6 8

y 24 21 18 15 12

O C. X0 2 4 6 8

y 24 18 13 96

D. 0 2 4 6 8

y 24 22 20 18 16