Answer: D- It is a nonlinear function because the output values are increasing at different rates.
Step-by-step explanation:
We know that in a linear function , there is always constant rate of change whereas if there is different rates of change of the variables then it is non- linear function.
We know that the rate of change of function =
From x=0 to x=1, the rate of change of function=
From x=1 to x=2, the rate of change of function=
From x=2 to x=3, the rate of change of function=
We can see there is increase in function but at different rates.
Therefore, D is the right option. It is a nonlinear function because the output values are increasing at different rates.