An open class system is based on social mobility that includes a. horizontal mobility. c. intergenerational mobility. b. vertical mobility. d. all of the above

d. all of the above

Ideally, an open class system is based on social mobility that includes horizontal mobility, intergenerational mobility and vertical mobility. Social mobility is an important factor in countries that want to give their citizens equal chances to succeed in life. Social mobility ensures that people can develop their potential and succeed regardless of their origin, their age, their gender, their social class, or any other factor that is outside their control.

c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.