The ruling in which of the following cases was based on
the supremacy clause?

Options are not given. Answer provided in a generalized way.

Matters directly related to law and treaties fall under the jurisdiction of supremacy clause. U.S constitution according to article VI supremacy clause work.

Explanation:

U.S constitution creates supremacy clause so that every nation under the jurisdiction of United States follow the same rule and norms decided by the judge as final decision of their unsolved disputes. Domestic equality must be followed by federal government. All the laws and treaties related with the nation's interest can be judged under supremacy clause.

Supremacy clause enjoy the supreme power over the land. All the judiciary, executive and administrative sections of U.S constitution are bound to follow the order of supremacy clause.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

i think the answer is b.