Why was the Cave of Lascaux closed to the public in 1963?

Question

Answer Options:

The floor of the cave was becoming eroded.
Colonies of algae and a calcite veil were developing on the cave walls.
Visitors were inadvertently smudging artwork.
Both A and B.

Answer 1

The Cave of Lascaux was closed to the public in 1963 primarily due to concerns about the preservation of the cave art, specifically because colonies of algae and a calcite veil were developing on the cave walls, as well as the erosion caused by visitors. Therefore, the correct answer is:

Both A and B.