Given:
The function is:

Find-:
Choose the parent function
Explanation-:
The function is
(A)

The parent function is f(x) = x
So,

(B)
The function is:

The parent function is f(x) = |x|
So it is not a parent function.
(C)
The function is:

The is similar types of graph that is

So the function f(x) = (x-3)² is not a parent function
(D)
The function is

So, the function f(x) = √x is a parent function.