Chaco Canyon, in modern-day New Mexico, is almost 600 miles from the Gulf of California and the Pacific Ocean. What does the presence of California seashells in archaeological digs tell us about the people who lived in Chaco Canyon 1000 years ago? (Choice A) A They used seashells to temper their pottery (Choice B) B Their empire extended to the Pacific Ocean (Choice C) C They had elaborate trade routes with societies that lived on the coast