Explanation: To display the location of a target in a two-dimensional space, such as on a radar screen or a graphical display, at least two distinct pieces of information are required. These typically correspond to orthogonal coordinates, like X and Y positions, or polar coordinates such as range and bearing. If each "sequential memory cell with target returns" is designed to store one of these fundamental parameters or components derived from the target's return signal, then two such cells would be needed. One cell could store data for the X-axis (or range), and the second cell could store data for the Y-axis (or bearing), allowing the target's precise location to be defined and displayed. Therefore, 2 sequential memory cells are the minimum required to provide the necessary positional data for displaying a target.