Answer: (3, -4)
note the y coordinate is negative
Unfortunately this point is not listed as one of the answer choices, but choice A is fairly close. I'm assuming your teacher made a typo.
See the attached image below to see why (3, -4) is the answer.
The idea is you draw horizontal and vertical lines through the given points. One pair of horizontal and vertical lines will intersect at (3, -4) which is the missing corner point. Specifically, the horizontal line through point A(-5,-4) and the vertical line through point C(3,4) intersect to form point D(3,-4).
