In the third picture : I would not play with any kind of electrical appliances which could harm me and i would also teach this to my siblings. I would not touch them with wet hands .
They can watch informal videos,take notes and participate in the class/ask questions.
My husband had 2 wisdom teeth removed, they used local anesthetics and it took less than an hour from check in to check out. keep in mind that if he has to be put under it might be more. Good luck.
You can prevent the spreading of communicable disease by following through with Option C) avoiding sharing personal items, like toothbrushes. All of the other options can lead you to getting a disease, if you ignore hygiene you will never be clean, and if you avoid insect repellent you might get a disease from a bug, and if you cough/sneeze without covering your nose/mouth then you may catch a cold. Therefore pointing to the correct answer option C.
I hope this helps! Have a good day!