The correct answer is d) must follow decisions made by the central government.

Explanation:

The governmental structure consists of three major components including federal, confederate, and unitary department:

• Unitary – a simple government system when the power is equally divided between all local offices although still controlled by a central department. It utilizes the concept of decentralization.
• Federal – unlike the unitary system, this one offers an opposite approach with local offices obtaining only partial autonomy.

Have a look at the picture to see how both modalities are presented on the map. As you can see. Most of the nations including England and the Philippines follow a unitary concept while the United States mainly relies on the federal government.