According to paragraph 2, early prehistorians thought the Aegean people of the Bronze Age might have influenced megalith building along the Atlantic seaboard because they A. had established commercial routes along the Atlantic seaboard B. had been in Iberia, where they introduced the idea of burial in very large tombs C. were thought to have found megaliths in Iberia when searching for metals D. were thought to have passed along the concept of burial in monumental tombs as they explored Brittany, Britain, North Germany, and Scandinavia