Out of the choices given, the one thing that signifies the period known as prehistory was there was no form of writing. The correct answer is C.
They knew that people were going to change, and that the Constitution had to change with them. In order to be a working document, it had to be changed to reflect what was going on. At the same time they wanted changes to be taken seriously so they made it difficult to change things.
The United States wanted a method of export and transportation to and from the United States originally when Panama was a part of Colombia. This is why they helped Panama's revolution to become its own independent country. If they had good relations and Panama went as planned, the US could finally build the canal they wanted so badly. The canal now allows transportation of many of the goods we purchase and use today here in the United States.