Which one of these countries borders with Poland?

Lithuania is the correct answer because it shares a land border with Poland. The border between the two countries stretches for approximately 104 kilometers and is located in the northeastern part of Poland. This border has historical and cultural significance as it was part of the former Polish-Lithuanian Commonwealth, which was one of the largest and most powerful states in Europe in the 16th-18th centuries. Today, the border acts as a link between the two countries, fostering economic and social interactions.