To rotate a point (x, y) by 180 degrees clockwise, you can use the transformation:
\[ (x, y) \rightarrow (-x, -y) \]
Applying this transformation to the point (5, 8):
\[ (5, 8) \rightarrow (-5, -8) \]
Therefore, the new point after a 180-degree clockwise rotation of the point (5, 8) is \((-5, -8)\).
The correct response is:
\((-5, -8)\)