Answer:
[tex]D.\text{ translates it 9 units up.}[/tex]Step-by-step explanation:
Using the rules for the transformation of functions, we can state that:
[tex]f(x)+b\text{ shifted the function b units upward}[/tex]Then, the transformation f(x)→ f(x) + 9 represents:
[tex]\text{ D. translates it 9 units up}[/tex]