Respuesta :

d. 16

1 to 2=1 2 to 4 is 2 4 to 7 is 3 and etc so 11 to 16 is 5 so answer is 16

1 + 1 = 2
2 + 2 = 4
4 + 3 = 7
7 + 4 = 11
11 + 5 = 16

The answer is 16.