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Jamestown was situated in a place in which it faced the ocean with one side of it to the land with a river protecting them from invaders. This allowed them ultimate protection from people that might be attacking them in ships from the ocean or invasions from the lands.
Therefore, the answers would be A: to allow people to watch for approaching ships, and D: to afford protection from the Indians.
The main cause was because they had already established land but the white settlers took it from them. For Native Americans, this was unacceptable.
The upward bound project was developed during the presidency of Lyndon Johnson. So your answer is A. Hope this helped :)
~ShadowKitty