Option 1 is correct. The Tropic of Cancer and the Tropic of Capricorn are imaginary lines that mark the northernmost and southernmost points on the Earth where the sun can appear directly overhead. The Tropic of Cancer is located at approximately 23.5 degrees north latitude, while the Tropic of Capricorn is located at approximately 23.5 degrees south latitude.

Both of these tropics pass through Africa. The Tropic of Cancer runs through the northern part of Africa, including countries like Egypt, Libya, Algeria, and Mali. The Tropic of Capricorn passes through the southern part of Africa, including countries like South Africa, Namibia, Botswana, and Mozambique.

Therefore, option 1, Africa, is the correct answer.