A: None. They don't have lightbulbs in caves
About 8000
Find out next time, on Dragonball Z!!!
Five. It's a huge problem.
None, it's a hardware problem!
None, they don't use light bulbs. They live in caves and use no forms of artificial energy because they wouldn't want to be perceived as hypocrites or morons.
A. They both look out their caves and see rubble.