The points (−4, 0) and (−7, 0) are placed on x-axis, and distance between these points is 3 units, then the square side has length 3 units. Since the third vertex is at point (−4, 3) (this point is at 3 units distance from (-4,0)), then the fourth vertex must be at point (-7,3) (this point is at 3 units distance from (-7,0)).
Answer: Correct choice is B.