A) Nothing, just totally naked
B) What you’re wearing and anything you carry with you (even if you’re not carrying it right now) like a bag
C) What you’re wearing, what you carry with you, and the contents of your home (it will be teleported within a few hundred metres on the surface in an accessible location, but obviously won’t be connected to any services like electricity or water)
To all the people in here saying “I could warn them and help them prepare to take on the conquistadores” while the sentiment is good, the conquistadores weren’t the ones that wiped them out, it was smallpox and other diseases. So unless you can synthesize a vaccine, or just expose them to it then so they can recover population in a couple centuries, they’re doomed no matter what.