What Scenario Would Be Ideal for the Use of a Prompter

Multiple Choice

What scenario would be ideal for the use of a prompter box?

A) You require a GUI element that restricts a user to a single choice of items out of a group of items.
B) You require a GUI element to display an error message upon incorrect input.
C) You require a GUI element to prompt for a user's text input.
D) You require a GUI element to allow a large amount of text to be entered by the user.