What button must be clicked to customize the sound of a transition?

To customize the sound of a transition in PowerPoint, the appropriate action is to click the sound arrow, which is a specific indicator associated with the transition settings. This arrow typically appears within the transitions tab when a transition effect is selected, allowing users to access sound options directly related to that transition.

By selecting the sound arrow, you can choose from various sound effects or even opt to import custom sounds to enhance the transition's impact on your presentation. This feature is particularly useful for making presentations more engaging and can help reinforce the thematic elements of your slides.

While other options may seem relevant, they might not directly provide the specific sound customization necessary for transitioning effects. Sound settings and effects options, for instance, cover broader sound adjustments and visual effects respectively, rather than focusing solely on the sound linked to transitions. Transition options may include various settings but do not focus specifically on the sound components associated with the transitions.