I think it's a)oil because it bring wealth into the region they are needed for much of the world's economy. ... Over half of the world's known oil reserves are found in this part of the world
If the reservoir has a dam, then it is A. But since your asking about just a reservoir, then the answer is B. If you think about it, a reservoir is almost like a lake, and it can overflow as well.
Answer: Aquaculture could help decrease the effects of human consumption of fish on freshwater and marine water habitats by producing food without taking away from over-fished environments.
Explanation: I HOPE THIS HELPS U!!!!
A volcano. Molten rock = lava = volcano. I hope this helps you!