Answer: C) an Anti-Federalist
Explanation: Though we may not be entirely sure of the specific person's name, we do know that this as written by an Anti-Federalist. This comes from "Brutus No. 1," in The Anti-Federalist Papers, a series of essays critical of the newly-drafted Constitution. Notice the author talks of the increasing power of the Congress at the expense of the states, a key item in the arguments of the Anti-Federalists.