What are the primary characteristics of combination skin?

Combination skin is characterized by having differing skin types in various areas of the face. The defining characteristic of combination skin is the presence of oiliness in the T-zone, which includes the forehead, nose, and chin, while the other areas, such as the cheeks, may be normal or dry. This duality in skin type is why option B correctly identifies the main features of combination skin.

The other options describe extremes of condition rather than the mixed nature of combination skin. Dry throughout the face implies a single texture and moisture level, which does not represent combination skin's variation. Always oily refers to skin that is consistently oily across all areas, contradicting the presence of dry or normal patches. Finally, always dry suggests a lack of oil production entirely, which again does not reflect the mixed characteristics of combination skin. Thus, the answer captures the essence of how combination skin presents itself across different regions of the face.