What Is the 'Bottom of the Pyramid' Concept

What is the 'bottom of the pyramid' concept?

A) Focus on alleviating poverty by raising the real incomes of the poor.
B) Focus on social enterprise or cooperatives to maximize the ability of the poorest to lift themselves out of poverty.
C) Focus on providing small loans to the poorest members of developing societies, who have no access to formal credit facilities.
D) Focus on offering innovative products and services to the world's poorest people.