Answer:
A. Rice.
C. Agriculture.
Step-by-step explanation:
Although West Africa was rich in natural resources, it experienced political instability when different tribes and kingdoms vied for control over the rice trade. This political turmoil was one of the factors that caused agriculture to grow in Africa.
It's important to know that rice has been cultivated in West Africa so many years ago, like 3000 years ago. At some point that zone were like a potency in this good, that's why tribes and kingdoms wanted to domain it.