If narration set on multiple layers, it overlaps

Thanks guys but I actually don't know how either option would work. I've attached the slide in question here.

Pausing the timeline on the layers doesn't stop me from selecting the shape. I'm not sure how the hotspot could be used to cover the other options up. For the interaction I want to show the details, i.e. the text as they click on each option but I don't want them to be able to click other options or play audio until the first one if finished.