I would say A. Electric burns, since the burn was caused by electric conductors and energized equipment. Thermal burns are caused by fire and I’m not sure what flash burns are but that doesn’t sound right so A.Electric burns.
I hope this helped! :-)
For some reason I have a little bit of doubt that this is related to your schoolwork, however this is important to learn to not do so by mistake. This would take a few minutes of inhaling fumes and is a very painful way to die. Even if it doesn't kill you, exposure can lead to brain damage and chemical burns. 5-10 minutes of non ventilated inhaling.
Answer:
Time isint a concern for me but money is :/
You could do rice water treatments and protective hairstyles (looser ponytails,braids)hair masks once a week to keep your hair hydrated