Which of the following describes a constitutional monarchy?

A constitutional monarchy is characterized by the limitation of the monarch's powers through a constitution. In this system, the monarch may serve as the head of state but is bound by the rule of law as outlined in the constitution. This means that while the monarch may retain some ceremonial duties and historical significance, the actual governance of the country is typically conducted by elected officials or a parliamentary system.

In contrast, other types of governance, such as absolute monarchies, do not impose such limitations on the ruler. Elected governments, devoid of a monarchy, operate under a different structure altogether, focusing on representative democracy rather than hereditary leadership. Likewise, a system where parliament holds all governing power typically aligns with a parliamentary democracy, which can operate independently of a monarchy. Thus, option B accurately captures the defining feature of a constitutional monarchy, as it emphasizes the legal constraints placed on the monarch, distinguishing it from other forms of government.