Answer:
C!
Step-by-step explanation:
So, it's actually very simple!
If you don't know, the domain of a function is the set of x-values that make the equation true. The range, which we are trying to find, is the set of f(x), or y values that are possible.
Now, notice how in the graph, y-values don't go below 1. So there is our limit. There is nothing else limiting the y-values the other way, so its basically a single equality.
y=1 is included in the function, of course, as it goes on y=1.
So, it's
Hope this helps!