Answer:
C. the states
Step-by-step explanation:
The power granted by the Federal government usually affect the nations as a whole (this include things such as foreign policies, national policies for Worker's right, health care, etc). The power granted to the states government on the other hand will only affect the people in one state. (this includes things such as states sales tax, states property law, etc)
According to the tenth amendment of the Constitution, any powers that are not specifically mentioned for the Federal government belongs to the States and the people. This created a clear supremacy that put the Federal government above the states government.