Can someone please help me?

Imagine you read a news article about state governments. It says they should have more powers. The writer says the federal government exists to serve the states, and not the other way around. Which of the following would support this argument? ( 3 points )

Group of answer choices:
A. The Supremacy Clause
B. The Tenth Amendment
C. Article I, delegated powers
D. Article IV, concurrent powers