The correct answer is option 4: Britain. The terms "Cabinet system" and "Collective responsibility" are indeed contributions of Britain. The Cabinet system refers to the system of government where executive decisions are made by a group of senior government ministers, known as the cabinet, who are appointed by the head of government, usually the Prime Minister. This system of collective decision-making is a key characteristic of the British parliamentary system.

Collective responsibility, on the other hand, is the principle that all members of the cabinet are collectively responsible for the decisions made by the government. This means that even if a cabinet member disagrees with a decision, they are still expected to support it publicly and be accountable for it. This ensures unity and cohesion among the cabinet members and promotes the idea of a unified government.

Therefore, it is clear that the Cabinet system and Collective responsibility are contributions of Britain.