The proposed Constitution, therefore, is, in strictness, neither a national nor a federal Constitution, but a composition of both. —James Madison, the Federalist Paper 39

How does this quote from James Madison represent a response to Anti-Federalist concerns?
A.
Madison is debating the Anti-Federalist need for a democratic system of government.
B.
Madison is answering Anti-Federalist concerns over a centralized national government.
C.
Madison is arguing against the Anti-Federalist demand for a single national government.
D.
Madison is responding to Anti-Federalist's desire to include a Bill of Rights.