Forager Clans and Tribes Had to Retreat Southward and Adapt

Forager clans and tribes had to retreat southward and adapt to the harsh environmental conditions when ____________.

A) Neanderthal hunting parties infringed on the forests controlled by Homo sapiens groups
B) The climate suddenly began to warm and the polar icecaps began to melt
C) Ash from a volcanic eruption dimmed the rays of the sun and dinosaurs began to die
D) The Ice Age hit their dwelling places