William has been living in a highly populated region in Eastern Europe for five years. He likes the region because the fertile soil allows him to have a small garden that always produces fresh vegetables, and he is only a few miles away from the forest. Based on the information provided, where does William live? A. on the eastern coast of the Caspian Sea B. in the heart of the Caucasus Mountains C. on the Northern European Plain D. on the Western Siberian Plain