A unitary system of government is characterized by a central authority that holds the majority of power, with any administrative divisions (like states or provinces) exercising only powers that the central government chooses to delegate to them.
Out of the provided options, none of them directly describe a unitary government. However, the closest concept to a unitary system would typically imply that local governments (like cities) have no independent power to create laws or rules without the central government's approval. Instead, they typically follow the guidelines set by the central authority.
Therefore, none of the listed statements accurately represent a unitary system since they all suggest some degree of autonomy or power for the states. If you had to select one option that might represent a more centralized governance structure (like a unitary system), none apply directly. However, in terms of general function, "States have equal powers with each other" indirectly reflects a unitary structure since it doesn’t imply an overarching authority allowing different powers to states. Nonetheless, this still doesn’t strictly define a unitary system.
If you need to choose one as the best answer given the options, I would recommend stating that none are applicable for a unitary system. If you need a definitive answer, please check the context or guidelines provided in your material.