Answer is in the graph of a 90 degree rotation
Step-by-step explanation
When we rotate a figure 90 degrees clockwise about the origin, each point of the pre image will changed from (x, y) to (y, -x) and it becomes the image
You didn’t give an image so I made one to show an example
Using point A to point A’
Our rule is
( x, y) to ( y, -x )
( -5, 2) to ( 2, 5) this is correct on the graph
This same change will happen with point B and C