Which one of the following rivers does not flow in Siberia?

The correct answer is (d), Article 4.

Article 1, 2, and 3 are all rivers that flow in Siberia. Article 1 is the Yenisei River, which is the longest river in Siberia. Article 2 is the Ob River, which is the second longest river in Siberia. Article 3 is the Lena River, which is the third longest river in Siberia.

Article 4 is not a river. It is the first article of the United States Constitution.