What is a landmark case?
a. a case that is based on a dispute over land
b. a case that is based on a previous court’s decision.
c. a case that sets a precedent for future court decisions
d. a case that has been overturned from a previous court.

The answer is C, a case that sets a precedent for future court decisions.  
The definition of a Landmark Case is a court case that is studied because it has historical and legal significance.  These cases have a lasting effect on the application of a certain law, which usually has to do with one's rights, freedoms, and liberties. Good luck :)

The way this small state - large state compromise guards against tyranny is that small states and large states have one note: i am sorry but i was not able to give you the full answer. but i got this answer from