The correct response is Africa and South America.
The coastlines of Africa and South America fit together due to the theory of continental drift, and both continents have mountain ranges that correspond with each other, particularly the Appalaichian Mountains in North America being similar to the Caledonian Mountains in Scotland and Scandinavia, but the more notable fit is between the Andes in South America and the mountain ranges in Africa.
The others do not have matching coastlines or significant corresponding mountain ranges.