What equipment is needed for showing videos during training?

The choice of "stuff to show videos" is correct because it encompasses all necessary equipment required for effectively presenting videos during training sessions. This may include a variety of tools such as a projector, a screen, or a display monitor, as well as audio equipment like speakers. The term "stuff" indicates a more general category that could include all these components, ensuring that the training experience is engaging and informative.

Other options are too narrow in focus. For example, the option that mentions just a projector does not account for the need for audio or a screen, which are also essential for video presentations. The reference to manikins and decontaminated supplies is unrelated to showing videos, as these are more pertinent to practical training exercises rather than video presentations, ensuring they do not provide the necessary context for this specific scenario. Lastly, while portable speakers are indeed an important aspect of video presentations, they are just one part of the overall setup needed to effectively show videos. Therefore, the most comprehensive and accurate answer is the one that encompasses all aspects of video presentation equipment.