J, (8,-3) because since they are diagonals, you can take the x and y values between the vertices and point of intersection.
For x
The distance between 2 and -4 is 6. Moving 6 in the other direction results in an x value of 8 (2+6)
For y
The distance between 5 and 1 is 4. Moving 4 in the other direction gives you a y value of -3 (1-4)
The answer is therefore (8,-3)
