Answer : 3. "Bolivia"
Explanation :

1. A total of ten countries are located on the Tropic of Capricorn. They are spread over three continents. Of the ten countries located on the Tropic of Capricorn, five are African countries.

2. They are Namibia, Botswana, South Africa, Mozambique and Madagascar. Argentina, Brazil, Chile and Paraguay are South American countries located on the Tropic of Capricorn.

3. Apart from five African countries and four South American countries, Australia is also located on the Tropic of Capricorn.