How Has Lewis-Williams Explained the Cave Paintings at Lascaux

How has Lewis-Williams explained the cave paintings at Lascaux?

A) The paintings represented totems, from which lineages or clans believed themselves to be descended.
B) The paintings were left by hunters seeking to mark the territory as their own, and provided a sign to other hunters that they were not welcome.
C) The paintings had no real symbolic meaning, and were essentially "art-for-art's sake," appreciated for its aesthetic value but containing little cultural meaning.
D) The paintings are related to altered states of consciousness, and ultimately represent Upper Paleolithic people pondering the meaning of life.