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.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.