To simplify \( \sqrt{125} \):
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Factor 125: \[ 125 = 5^3 \]
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Apply the square root: \[ \sqrt{125} = \sqrt{5^3} = \sqrt{5^2 \cdot 5} = \sqrt{25 \cdot 5} = \sqrt{25} \cdot \sqrt{5} = 5\sqrt{5} \]
So, the simplest form of \( \sqrt{125} \) is \( 5\sqrt{5} \).
Since none of the provided responses include \( 5\sqrt{5} \), if you're looking for the numerical value, calculating \( \sqrt{125} \) gives approximately 11.18, which is not in the options either.
The closest option available to simplify \( \sqrt{125} \) is \( 5 \), but it's not the complete simplification. Therefore, if answering directly from the choices provided, the best answer would be if just '5' is mentioned (although it's not correct without including \( \sqrt{5} \)).