Native Americans lived in teepees as they followed herds of bison across the Great Plains. Which of the following environmental factors led bison to flourish in the Great Plains? Choose 1 answer: Choose 1 answer: (Choice A) A The wet grasslands of the western Great Plains created prairie ideal for grazing. (Choice B) B The arrival of horses in 1519 made it easier for Native Americans to herd and breed bison. (Choice C) C The melting of glaciers provided new water sources for bison herds. (Choice D) D Bison were chased onto the Great Plains by prehistoric predators.