Astride horses, American Indians could hunt far more effectively in many parts of the West, especially among the vast herds of bison on the Great Plains. Those bison were hunted not just for their meat but also their hides, which women processed into robes to feed a hungry market in the east and Europe. Horses thus expanded Native trade and brought a flow of new items into their lives—a trade invigorated also because Indians could travel so much farther and faster than before. As from the time of the first horse cultures in central Asia, western Indians exploited a new military potential. Some groups quickly developed astonishing skills as mounted warriors and proceeded to expand their hunting and trading territories against weaker neighbors. –Elliott West "The Impact of Horse Culture” Despite geographic separation and diverse environments, many American Indian peoples used some common practices. According to the excerpt, which practice was unique to the Plains Indians? A) The use of hunting both for food and for material resources such as skins and bone. B) The division of labor between males and females to meet the needs of the community. C) The development of permanent settlements for trade and agriculture. D) The use of the domesticated horse in hunting and warfare.