Answer:
A. Article IV grants powers to states while limiting the powers of the federal government.
Step-by-step explanation:
The article IV of the U.S. Constitution on its section 1 and 4 guaranteed the powers each state have and the responsibilities the Federal government will let them keep.
Section 1 says that while Congress shall make general laws to prescribe the manners in which acts and proceedings must be made. The States that obey those procedures will receive full faith and credit to those acts.
Section 4, on the other hand, is a guarantee that the United States will protect the states of any invasion.
The states maintain the power that they don´t delegate to the United States Federal government.
I hope this answer helps.