Answer: Sorry, No. It's A. (1,-2)
Attachment shows your screenshot rotated 270°
Step-by-step explanation: When the image us rotated 270°, E' will be in the 4th quadrant. Side DE will be parallel to the y axis. E' will be at coordinate (1-2)
A 270° rotation about the origin is like turning the hand of a clock counterclockwise from 12 to 3. That's what happened to vertex A.
