What process involved the diffusion of culture throughout Sub-Saharan Africa between 500 B.C. and A.D. 1000?

The Bantu Migration is the correct answer as it describes the significant movement of the Bantu-speaking peoples across Sub-Saharan Africa between 500 B.C. and A.D. 1000. This migration had profound effects on the cultural landscape of the region, enabling the spread of language, agricultural practices, and ironworking technology among various communities. As the Bantu migrated, they interacted with different groups, which facilitated the exchange of ideas and customs, leading to a rich blending of cultures throughout Sub-Saharan Africa.

The other options do not accurately represent the diffusion of culture in this context. The Silk Road primarily connected Asia with Europe and the Middle East, focusing on trade rather than the internal cultural movements within Africa. The term Cultural Revolution is often associated with specific political and societal upheavals, notably in China, rather than a general process of cultural diffusion in Africa. Colonial Expansion typically refers to European powers establishing control over African territories in the 19th century, which occurred much later than the timeframe in question and involved the imposition of foreign cultures rather than an indigenous cultural diffusion process.