The supremacy clause, stipulated in article vi of the constitution, holds that
a. in a conflict between federal and state laws, the former will override the latter.
b. in the federal system established by the constitution, the true source of sovereignty is the people.
c. federal laws will be supreme in the national sphere, and state laws will be supreme in local affairs.
d. as a sovereign institution, the state government only needs to obey the limits that it establishes for itself.

A. In a conflict between federal and state laws, the former will override the latter.

Explanation:

The Supremacy Clause establishes that all federal laws are the supreme law of the land and therefore all states, federal officers and judges are bound by it. This means that if a state law is in conflict with federal law, it is the federal law that must prevail: Federal laws override state laws. By describing the relationship between federal and state power, this clause sets the root of the U.S. federalism.

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long