Most human hair used commercially is sourced from which regions?

The correct choice highlights that most human hair used commercially is sourced from India and Asia. This is primarily due to the abundant supply of hair available in these regions, where hair is often collected from individuals who undergo religious practices, such as the tonsure seen in Hindu temples. The cultural significance attached to hair in these areas contributes to a vast and consistent supply.

Additionally, India and various Asian countries provide hair that is often of high quality, with many strands being thick and healthy, making it preferable for use in extensions and wigs. These regions have developed a robust industry around hair sourcing, processing, and distribution, ensuring that the hair meets the demands of global markets. In contrast, other regions have less availability of human hair for commercial purposes, which is why they are not the primary sources.