Answer:
You included no options so I will be general in the answer.
Regions are areas that share certain characteristics so in this case, a region will be the area that shares physical factors.
These factors include;
- Landform - These are the physical features that the areas might share such as being mountainous, having valleys, deserts, plains, plateaus and the like.
- Climate: Regions generally share the same type of climate and so areas close to each other with the same climate can be classified as being in the same region. For instance, areas near the equator receiving rainfall all year round with high humidity have a tropical climate and so are tropical regions.
- Soil: The soil in a region is usually similar as well so this can be used to classify a region. For instance, desert areas will have more sandy soil then other types.
- Natural Vegetation : The natural vegetation can also enable Geographers to classify areas as regions if the vegetation is similar. For instance shrubs in semi arid areas and tall canopy like trees in tropical rainforests.