Ask this question again, you're going to need a more specific time the president has done this. however, if you are asking about WWI, the USS Lusitania, the Zimmerman Telegram, German U Boats targeting American ships, and so on.
The Belgian Monarch claimed it as a buffer zone between German and British claims in Africa as a way to "Prevent fighting."
Probably rivers and water sources, because you need water to farm, and the water by rivers is rich and the soil is good. So yea the rivers and other water sources would be the main thing.
The politically correct answer is tell the teacher, or let the teachers come.
Explanation:
Normally your supposed to not get involved, or do nothing.
Hope this helps!
The answer is A - formally or informally.