Megaliths found along Europe's Atlantic seaboard have long puzzled scholars. A. The Bronze Age Aegeans most probably built some of the tombs in Iberia. B. Scientific evidence supports the idea that the megaliths were a western and northern European invention. C. Most megaliths are found in coastal regions, suggesting that people fishing may have used them to guide their travels. D. Archeologists have found enough indicators to believe that the layout of tombs in the landscape reflects each community's social organization. E. The high proportion of coastal megaliths has given rise to the idea that megalith building was related to fishing. F. It has been suggested that megaliths arose in response to the spread of agriculture and competition for farmland.