The correct answer is B. The implementation of a Bill of Rights
Step-by-step explanation:
Many anti-federalists did not support federalism because this implied the creation of national government and anti-federalists were afraid this national government would limit individuals' and states' freedoms or would act as a despotic form of government. This perspective changed once they were promised a Bill of Rights because this guaranteed the freedoms of people and states would be respected by the national government and the actions of the national government could not violate basic rights.