The Clovis Tradition,a Sophisticated Stone Technology Based on a Sharp

The Clovis tradition,a sophisticated stone technology based on a sharp point that was fastened to the end of a hunting spear,flourished (widely but briefly) in the central plains and in what is now the eastern United States.Until recently,the Clovis people were considered the first settlers of the Americas.Recent research now suggests,however,that

A) the Americas were settled by one haplogroup-a lineage marked by one or more specific genetic mutations.
B) the wheel, which has never been found in Clovis sites, was a critical part of an even earlier arrival to the Americas.
C) the members of the Clovis tradition depended on the domestication of horses to make travel possible.
D) various groups of colonists entered the Americas, but they all used the same route.
E) most likely the Americas were settled by several colonists who came at different times, perhaps by different routes, and had different physiques and genetic markers, which continue to be discovered and debated.