Constitutional government means
Explanation
Constitutional government is defined by the principle of **Constitutionalism**, which means a government whose authority is strictly limited by the terms of the Constitution to prevent the arbitrary exercise of power. While option (a) describes common features like federalism or representation, these are specific organizational forms rather than the fundamental definition of constitutionalism. The core concept being tested is **Limited Government**, which ensures that the state's power is legally restricted to protect individual liberties.