Hm, this is not an easy question.
Generally the best way to prevent a nuclear disaster is not to have any weapons, so A would be a good option. But in the modern world, complete destruction of all weapons is not feasible, and people believe that since US and Russia limited their number of weapons, this is no longer such a big concern (option D, which is I think the best. Personally, however I faviour A as a solution to the problem of nuclear weapons).
The technology that we have versus theirs
An idea for a bill can come from anybody, however only Members of Congress can introduce a bill during Congress. So True.
Answer:
I'm pretty sure that the answer is an artefact.
Panama Canal--the land for the canal was provided after aiding the Panamanians in their independence from Columbia.
The Panama Canal allowed for quicker shipping between the west to the east coast of the US.
