Multiple hot spots find them all question

It's not clear to me if you want a graded question that tests whether the user can pick out all the hazards or if you just want an interactive slide. 

A Freeform pick-many question would work to test whether the user can click/select all the hazards.

• If you do this, I suggest you use 99%-transparent shapes (not hotspots). Shapes can have states, so a Selected state could make it obvious if the shape has been clicked.
• This type of graded question doesn't provide info about each clicked item when it is clicked. You could put all that info into the feedback layers (though I'm guessing that would get crowded).
• Here's more info about Freeforms: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-convert-existing-slide-to-freeform-interaction 

If you want to show info about each hazard when the user clicks on the area, then I suggest using the same type of 99%-transparent shapes. Give them triggers that show a layer with the corresponding info. You could have shapes over non-hazards, with the corresponding layer explaining why that's not a hazard.