How Is It Known That the Iroquois Chiefdoms Were at War

How is it known that the Iroquois chiefdoms were at war with each other prior to the creation of the confederacy?

A) Oral histories from the nineteenth century contend that Iroquoia was wracked by warfare during that era.
B) The Hiawatha wampum tells the story of the warfare from that era.
C) Written records from that era have been unearthed in Jesuit archives.
D) Skeletons have been found with embedded spear points in them in present-day upstate New York.