Which of the following is a benefit of using a protein and moisturizing treatment?

Using a protein and moisturizing treatment primarily benefits coarse and extremely curly hair due to its unique structure and needs. Coarse and curly hair types often struggle with moisture retention and structural integrity because of their shape and texture. The protein in these treatments helps strengthen the hair by filling in gaps in the cuticle, which can become damaged over time due to styling and environmental factors. Simultaneously, moisturizing ingredients help hydrate and soften the hair, improving manageability and elasticity, which are crucial for maintaining the health of curly and coarse textures.

The need for both protein and moisture is particularly pronounced in these hair types, as they are more prone to dryness and breakage. By using a treatment formulated to provide both, individuals with coarse and extremely curly hair can achieve better results, such as reduced frizz, improved curl definition, and enhanced smoothness.