Answer:
I believe choice D is your answer!
Explanation:
A vassal is a person regarded as having a mutual obligation to a lord (or monarch), in the context of the feudal system in medieval Europe.
Hope this helps!
The McCulloch v. Maryland is the case that went to the Supreme Court because the state of Maryland wanted to tax the National Bank established by the Congress. The court ruled that under the Article I, Section 8, the "Necessary and Proper" clause that the state could not tax the institution of the the federal government. This is an landmark case and its effect was that this supported the federal government over the state governments.