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

Question

(2 points)
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 correct answer is Both A and B. The Cave of Lascaux was closed to the public in 1963 due to the erosion of the cave floor and the development of colonies of algae and a calcite veil on the cave walls, both of which were exacerbated by visitor traffic.