In Which of the Following Situations Would It Be Most

Multiple Choice

In which of the following situations would it be most appropriate to use a trigger?

A) You want to change an existing picture so when someone clicks on it, it plays a sound.
B) You want to add a clickable connection to a web site that launches a web browser when clicked.
C) A presentation needs a button on the last slide that will allow the user to go back to the start of the presentation.
D) None of these are situations to use a trigger.