Respuesta :
Personally, 2 would be my best guess as the rest don't really do much in the way of explaining lifeguarding basics.
Answer: 2. a video clip of a successful shallow-water rescue.
Explanation: when making a presentation it is very important to have the necessary elements to make the presentation as clear as possible and easy to the audience to follow. If we are making a presentation about lifeguarding basics, a great way to exemplify the information is to include a video clip of a successful shallow-water rescue, so the correct answer is the corresponding to option 2.