Does the Constitution Guarantee That the Federal Government Has Positive

Does the Constitution guarantee that the federal government has positive obligations to the states?

A) No. Insofar as the federal government has positive obligations to the states, these developed over time and are not a part of the Constitution.
B) Yes. The federal government has constitutional responsibilities toward the states, such as the Tenth Amendment's reserved powers clause.
C) Yes. The federal government has constitutional responsibilities toward the states, such as Article IV's guarantee that the states' republican governments will be protected from invasion and domestic violence.
D) Both of the last two options