Is there more to the question? A passage or something?
In vertical files libraries store small printed material. They does not contain original documents or coprehensive information about particular subjects, it usually poses as photocopies, or papers with simple non essential information.
It won't be helpful for studying, but it can be a lot of fun, because you will never know what exactly you can find in there.
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Part 3 is related to the claim because it describes what problems the nation is facing because of the claim's statement. It serves to show that there are a wide range of activities that people with disabilities will not be able to do, simply because they are discriminated against. Hence, "America was founded on the basis that all men are created equal...", which you will likely hear a lot more than just once. :)
The answer should be number 4
