Answer: 2. a video clip of a successful shallow-water rescue.
Step-by-step 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.