Societies that permit a great deal of mobility are called:​

A) ​open-class societies
B) ​mobile societies
C) ​closed-class societies
D) ​nontraditional societies

Open-Class Societies

Societies characterized by the opportunity for social mobility and the ability for individuals to change their socio-economic status.

Mobility

The ability to move or be moved freely and easily, whether referring to physical movement of individuals or social mobility within hierarchical structures.