Answer:
a) A federal statute conflicts with the U.S. constitution.
b) A federal statute conflicts with a state constitutional provision.
Explanation:
As per the Article Vi of the United States constitution, the constitution represents the supreme law of the land if there is any kind of violation that would be declared as non-constitutional and hence not enforced irrespective of what source should be enforced
Also the statutes of the federal state took pattern over the provision of state constitution
Hence, the a and b are correct