You can change the shape of a picture by grabbing the corner with the mouse and dragging it. So you can change the picture from landscape to portrait shaped. You will need to move the answer button around. See
https://xatquiz.com/gallery/showimage.php?i=75&c=11 for an example of this.
If you plan to do this a lot you can edit one of the layouts or insert a new layout.
Chris.