Final answer:
West Africa independently developed agriculture based on yams, including other crops like oil palm, peas, groundnuts, and a unique African variety of rice.
Step-by-step explanation:
The African region that independently developed agriculture based on yams is West Africa. The Niger-Congo peoples of West Africa gradually domesticated yams and other crops like oil palm, peas, groundnuts, and a unique African variety of rice. This agricultural development began around 3000 BCE.