They did this because they knew things would change overtime that that we would need to be able to change the constitution accordingly. However the process to amending the constitution in a long one and it is very difficult to do so. <span />
This kind of horrific...just a warning. Kids would be given dog tags as a sign of identification. At that time, the nuclear war was taking place. Parents would have their kids wear dog tags so that if they died, they would be able to identify the children's bodies.
The answer is C.
Hope that helps :)