The arrows in this map illustrate "The diffusion of technology across Africa"
In Southern Africa most iron ore reserves lie in South Africa itself. The chief deposits are at Postmasburg, in the Bushveld Complex, at Thabazimbi, and in the vast low-grade deposits of Pretoria. There are also substantial reserves in Zimbabwe.
Iron played a central role in many societies of early Africa. It held both spiritual and material power. Physically, Africans used iron to create tools for agriculture, utensils for everyday life, and weapons for protection and conquest. The spread of Iron technology is shown in the map of Africa in different times.
Hence, option A is correct.
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