It should be A, since before the Spanish came, there were no horses in the America's. With horses, the Indians were able to hunt more efficiently and had a better way of transportation.
By the way, can you answer one of my questions? Thanks!
The role of The Protestant Reformation in the history of the United States of America. Over the centuries there had been many reform efforts within the Catholic Church, The term Protestant was not initially applied to the reformers, but later was used to describe all groups protesting Roman Catholic orthodoxy.