PLEASE HELP I AM GIVING 20 POINTS I NEED EXPLANATION PLEASE HELP quadrilateral labeled warehouse with ellipse inscribed labeled whisper chamber with point at center and distance to two points on either side of the center labeled 10 yards and horizontal width of ellipse labeled 50 yards

A designer wants to create a whisper chamber in the shape of an ellipse. He has a warehouse space with a longest length of 50 yards, which he decides will be the major axis of his elliptical chamber. He determines the best spots for his guests to stand to experience his whisper chamber will be 10 yards from the center of the warehouse space, which will act as the foci. How far out from the center, along the minor axis should he build out his whisper chamber?
53.9 yd
45.8 yd
26.9 yd
22.9 yd