Concept:Fourth republican government in Ghana began with the 1992 Constitution.Explanation:Ghana’s Fourth Republic was established in 1992 after a new constitution was approved and multi-party elections were held.Key point: The 1992 Constitution was approved by referendum on 28 April 1992 and elections followed in November/December 1992; the Fourth Republic was formally inaugurated on 7 January 1993. 1981 was the 31st December coup, 1966 the overthrow of Nkrumah and 1979 the start of the Third Republic.Answer:Option D (1992)