Answer: The answer is D diverese multiple languages, religions, and forms of government
Explanation: Though they were hit hard by plague they were not cut off from trade as tribes regularly traded with one another therefore A and B are wrong. C is wrong as they were not orginized into large empires with same religious beliefs as there are many diffeferent religions, forms of government as well as languages.
There's nothing a government can do to clean it up as long as 100 million people keep dumping in it, and that will continue until an alien life form spontaneously rises out of its sacred waters some moon-lit night and terrorizes some town's people.
