The correct answer is: D. Title bar.
The title bar is the bar at the top of a window that contains the window’s title. You can move a window to a different position on your screen by dragging it by its title bar.
The move handle is the small, square box in the upper-right corner of a window. You can use the move handle to resize a window.
The tail is the thin, vertical line at the bottom of a window. You can use the tail to minimize a window.
The status bar is the bar at the bottom of a window that displays information about the window, such as the current date and time. You cannot move a window by dragging its status bar.