What was concluded to be the most effective unit of social organization for foraging societies?

A) the nuclear family
B) the extended family
C) the band
D) the married couple

The band, typically consisting of a small, kinship-based group of around 20-50 individuals, was concluded to be the most effective unit of social organization for foraging societies. This structure allowed for flexibility, cooperation in hunting and gathering, and sharing of resources, which were crucial for survival and adaptation in various environments.