Both parliamentary and unitary systems

A. deny voting rights to their citizens.
B. Give most power to the states.
C. Have strong national executive leaders. **
D. Forbid local governments from making decisions.

Correct.

C. Have strong national executive leaders.

Both parliamentary and unitary systems have strong national executive leaders. In a parliamentary system, the executive leader is usually the Prime Minister or Chancellor, who is elected by the parliament and holds significant power. The Prime Minister is responsible for implementing policies and making key decisions.

In a unitary system, power is concentrated at the national level, and the executive leader, such as a President or Prime Minister, exercises substantial authority. They are responsible for implementing national policies and leading the government.

To arrive at this answer, you can compare and contrast the characteristics of parliamentary and unitary systems. Consider the structure of governance, the distribution of power, and the role of the executive leader in both systems. This will help you identify that both parliamentary and unitary systems have strong national executive leaders.