The Tropic of Cancer is one of the five major circles of latitude that mark the Earth`s position in relation to the Sun. It is located at approximately 23.5 degrees north of the Equator. Among the four countries listed in the options, the Tropic of Cancer passes through Mali.
North Sudan, option 1, is located south of the Tropic of Cancer and does not cross this latitude line.
Chad, option 2, is also located south of the Tropic of Cancer and does not pass through this latitude line either.
Yemen, option 4, is situated on the Arabian Peninsula and is much farther east than the Tropic of Cancer.
Mali, option 3, is the correct answer as it is located in West Africa and the Tropic of Cancer passes through its northern region. It is important to note that the Tropic of Cancer does not pass through the entirety of Mali but crosses its land territory.
Therefore, the correct answer is option 3, Mali.