A. Balance and symmetry would be the most appropriate screen design techniques to maintain consistency in the content and images on the web page about the basic parts of a camera. Balance refers to the even distribution of elements on the screen, and symmetry is a specific type of balance that involves creating a mirror image effect. By applying balance and symmetry, Jason can ensure that the content and images are evenly distributed and aligned, which can make the web page more visually appealing and easier to understand.