Read this excerpt from "Nelson Mandela's Nobel Prize Acceptance Speech": We understand their call, that we devote what remains of our lives to the use of our country’s unique and painful experience to demonstrate, in practice, that the normal condition for human existence is democracy, justice, peace, non-racism, non-s**ism, prosperity for everybody, a healthy environment, and equality and solidarity among the people.

Which sentence best explains how Mandela demonstrates his leadership qualities in this excerpt?

A. He speaks on behalf of his nation, vowing that it will be a model for equality that can be followed around the world.

B. He refers to relationships he has created between his own country, South Africa, and other nations that want to follow his model.

C. He sets a goal to win a political role in his nation so that his ideas can be put into action.

D. He calls on followers to change their behaviors and follow rules he has set out.