Hayden has classified the races on the basis of hair in his book:

Correct option is B

Hayden classified races based on various physical characteristics, including hair texture and color, in his book "Races of Man." This classification system aimed to categorize human populations by identifying shared physical traits. The book played a crucial role in the development of early anthropological studies and racial classifications, though such frameworks are now considered outdated and overly simplistic due to their inherent biases and the advances in genetic research.
Information Booster:
· Hayden’s classification focused primarily on physical traits like hair texture, skin color, and cranial measurements.
· "Races of Man" contributed to early anthropological studies but faced criticism for lack of scientific rigor.
· Hair texture was categorized as straight, wavy, or curly, linking it to different racial groups.
· Modern anthropology emphasizes cultural and genetic diversity over physical characteristics.
· Biological race classifications have been largely replaced by population genetics.