Concept: Ghana’s most recognised contribution to the United Nations Organisation is its participation in peacekeeping missions.Explanation:• Ghana has contributed troops and military personnel to several UN peacekeeping operations across the world.• This is considered its greatest contribution because it helps maintain peace and security internationally, which is a core purpose of the UN.• The other options are useful but less significant than Ghana’s long-standing peacekeeping role.Answer: A. Troops for peacekeeping operations