To rotate a point \((x, y)\) by 90 degrees clockwise about the origin, you can use the transformation:
\[ (x, y) \rightarrow (y, -x) \]
For the point \((-4, -6)\):
- Replace \(x\) with \(-6\) (the original \(y\)).
- Replace \(y\) with \(-(-4)\) (the negative of the original \(x\)).
So, the new coordinates after rotation will be:
\[ (-6, 4) \]
Thus, the new point when \((-4, -6)\) is rotated 90 degrees clockwise about the origin is \((-6, 4)\).
The correct answer is \((-6, 4)\).