To determine the new point when the triangle is rotated 90 degrees counterclockwise, we can analyze the movement of each vertex.
Given point A (2, 4) in Quadrant I, when rotated 90 degrees counterclockwise, the x-coordinate becomes the negative of the y-coordinate, and the y-coordinate becomes the x-coordinate.
Therefore, the new point will have coordinates (-4, 2).
So, the correct response is: (−4, 2)