Concept:The Nguni are a Bantu-speaking group traditionally associated with Southern Africa.Explanation:The Nguni peoples include the Zulu, Xhosa, Swazi, and Ndebele. Their ancestral homeland and historical centre of settlement are in South Africa. From South Africa, some Nguni groups spread to neighbouring territories in Southern Africa. Thus, out of the options given, South Africa is the correct place of origin.Answer:A. South Africa