题目

Dogs were living as companions to the early settlers of North America over 10,000 years ago.The oldest domestic dogs in the Americas were thought to be around 9500 years old. Angela Perri of Durham University, UK, and her colleagues have carried out fresh radiocarbon dating on the two dog skeletons that gave this date, discovered in the prehistoric Koster site in Illinois, and found they were even older: around 10,100 years old.A third dog from another Illinois site called Stilwell II was older still，at 10,190 years old. That makes it the oldest known domesticated dog in the Americas.The teaA ceremony was held ________ those killed in battle.A.in place ofB.in charge ofC.in favour ofD.in honour of