Which of the following is the linear parent function

Answer:
Option C is correct linear parent function.
Step-by-step explanation:
We need to choose from the option as a linear parent function.
We will look each option and explain each one.
Option A: [tex]f(x)=|x|[/tex]
Here we have absolute sign on x. It is parent function of absolute function.
Option B: [tex]f(x)=x^2[/tex]
Here we have square on x. It is parent function of quadratic or parabola.
Option C: [tex]f(x)=x[/tex]
It is parent function of linear because exponent of x is 1 and coefficient of x is 1.
Option D: [tex]f(x)=2x[/tex]
It is linear function but not parent because coefficient of x is not 1.
Hence, Option C is correct linear parent function.