In which of the following systems of government is the principle of collective responsibility best upheld?

The principle of collective responsibility is best upheld in a cabinet system of government. In a cabinet system, the executive power is vested in a group of ministers who are collectively responsible to the legislature for the policies and decisions of the government. This means that all members of the cabinet are equally responsible for the actions of the government, and they must all support and defend government policies, even if they personally disagree with them. If one member of the cabinet disagrees with a policy or decision, they must either resign from the cabinet or accept the principle of collective responsibility and publicly support the government's position. The principle of collective responsibility ensures that the government acts as a cohesive unit and that decisions are made based on consensus rather than individual preferences. Overall, the cabinet system is designed to promote unity and accountability in the government and to ensure that all members of the executive are fully committed to the policies and decisions of the government.