The most common form of migration experienced in countries of Tropical Africa is.

In countries of Tropical Africa, the most common form of migration is rural-urban migration. This is the movement of people from villages and rural areas to towns and cities.

Several factors drive this pattern:

• Push factors in rural areas include limited employment opportunities, poor infrastructure (roads, hospitals, schools), low agricultural income, and lack of social amenities.
• Pull factors in urban areas include the prospect of better-paying jobs, access to education and healthcare, improved living standards, and the attraction of modern amenities.

Rural-rural migration (movement between farming communities) does occur but is less dominant because conditions in one rural area are often similar to another. Urban-urban and urban-rural migration are even less common in Tropical Africa, as the overall trend is movement toward cities driven by rapid urbanisation.

The correct answer is rural-urban migration.