In pech merle, red painted dots note what about the spot?
a. someone is buried there.
b. the spot was where lyres were played.
c. rocks often fall from that place when noise is made.
d. the spot is where sound best echoes.

Correct answer choice is:

D. The spot is where sound best echoes.

Explanation:

Pech Merle is one of the rare ancient cave art sites in France which persist exposed to the common people. Spreading for more than a mile from the entry are holes the walls of which are coated with exciting paintings beginning from the Gravettian art. Amongst around 20 samples, only one (in the region shown by the red dot) carried plenty of charcoal to be ready to be seen to around 25 000 BP.