I think that these are the answers for your questions.
3. B
4. B
Answer:
The Velekete Slave Market established in 1502 in Badagry, Lagos State, was significant during the Trans-Atlantic Slave trade in Badagry as it served as a business point where African middlemen sold slaves to European slave merchants thus making it one of the most populous slave markets in West Africa.
Explanation:
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.