SAT Question 8b9960b2: Linear Functions answer and explanation with Desmos solution

Choice C is correct. It’s given that the equation $f(x)=108-9x$ represents the number of free muffins that remain to be given away after $x$ hours. For the given equation $f(12)=0$, when the value of $x$ is $12$, the value of $f(x)$ is $0$. It follows that after $12$ hours there are $0$ free muffins remaining to be given away. Therefore, based on this context, it will take $12$ hours to give away all the free muffins.