Final answer:
Excavations at Niani confirmed the presence of a well-structured and organized ancient city with evidence of social hierarchy, labor specialization, and agrarian development. Option 1.
Step-by-step explanation:
Excavations at Niani have revealed the remains of houses and their stone foundations, which suggest a well-structured and organized ancient city. This is evidenced by the sophisticated planning and construction facilities that indicate social hierarchy, specialization of labor, and the development of agrarian societies.
The evidence from Niani confirms the existence of a prosperous community which means that these ancient people engaged in agricultural production, trade, and exhibited social stratification, and the presence of monumental structures highlights the wealth and power of their ruling class. Option 1.