Answer:
 (c)  The domain of the graph is all real numbers less than or equal to 0.
Step-by-step explanation:
You want the correct description of the domain or range of the function ...
 f(x) = √(-x).
The function is defined for non-negative values under the radical:
 -x ≥ 0
 x ≤ 0 . . . . . multiply by -1
The domain of the graph is all real numbers less than or equal to 0, choice C.
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Additional comment
As you can see in the attachment, the range (vertical extent) is all real numbers greater than or equal to 0, as it is for any square root function.
