what preserved the art of Altamira until modern day?

Question

a the Paleolithic inhabitants sealed off the cave once all the walls and ceilings had been painted
b the Paleolithic inhabitants covered their artwork with a layer of animal fat to protect the paintings
c a natural collapse at the end of the Upper Paleolithic period
d an intentional collapse by the people of the Upper Paleolithic period

Answer 1

The correct answer is a: the Paleolithic inhabitants sealed off the cave once all the walls and ceilings had been painted. This sealing helped to protect the artwork from the elements and human interference, preserving the paintings until their rediscovery in modern times.