The domain is the x value of the graph. I suggest going down the choices and finding which of them is an x value of the function...
Since there are 5 ticks and the 5th tick is 10, we can tell that each tick stands for 2 units. I would label them before we start.
Okay...
-4 cannot be an option, because the x value, -4 is on the 2nd tick mark and the function only goes to the 1st tick.
0 is an option!
5 is not.
-1 is!
4 is!
-2 is!
so we have B D E F
