Final answer:
Eastern Europe includes countries like Poland, Romania, Albania, and Russia. Scotland, Ireland, Oman, Crete, Transylvania, and Mauritania are not part of Eastern Europe.
Step-by-step explanation:
The Eastern European region comprises several countries that were once part of the Eastern bloc during the Cold War era. This region is traditionally known for including countries such as Poland, Romania, and Russia, among others. Option B from the question contains several correct countries; however, Scotland, Ireland, and Oman are not part of Eastern Europe. Scotland and Ireland are located in Northern Europe, while Oman is in the Middle East. Transylvania is a region within Romania, and Crete is an island belonging to Greece. Therefore, the correct countries from the list provided that are part of the Eastern European region are Poland, Romania, Albania, and Russia.