Which Is a True Statement About the Powers of the National

Which is a true statement about the powers of the national government?

A) The only powers of the national government are those specifically stated.
B) The amount of power the national government has exercised has grown over the last 200 years as a result of the "necessary and proper clause."
C) Powers are determined by the supremacy clause.
D) Powers of the national government are equal to the powers of the state governments.