B districts is the correct answer!
The main result of the Supreme Court decisions in McCulloch v. Maryland and Gibbons v. Ogden was that the federal government was allowed to continue to exercise its power to regulate interstate commerce over the states.
Oversight and public education are examples of "implied" Congressional functions, since these actions are not specifically mentioned in the Constitution, but are within Congresses' umbrella of power.
The treaty of Versailles put restrictions on the amount of military power Germany was allowed to have at one time. Germany's army could have no more than 100,000 men and had to demobilize the rest. They were also prohibited from arms trade as and limits were imposed on how many tanks, aircraft's, armored cars it could have.
Hope this helps :)
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