Graphical pictures that represent an object like file, folder etc are:

Graphical pictures that represent an object like file, folder etc are known as Icons.

Icons are small graphical representations of programs, files, folders, and other objects on your computer.

Task bar is a bar displayed on the screen that contains buttons for running programs and other controls.

Windows are the rectangular areas of the screen where programs and content are displayed.

Desktop is the main screen area that you see after you turn on your computer and log on to Windows.

Therefore, the correct answer is Option C: Icons.