The answer is unsure to me because i don't see the examples above, but I'd go with d.
<span>a. East Africa
</span>it is near the horn of Africa.
So sorry but I'm not answering your question cause I really didn't come here to help people, you see I'm a chaotic evil, so I'm pretty sure I'll just go around this website doing the same thing to other people that I'm doing to you. While getting answers myself.
Answer: C, agriculture/farming. explanation: the economy of the south was mostly based on agriculture.