Given the task definition and input, reply with output. You are given a statement written in Assamese. Choose the most logical word from the given 4 options which can be used to replace the <MASK> token in the statement. Output the word from the correct option .

Statement: |West Siberian Plain – east Caspian Sea (part of <MASK>, Kazakhstan, Uzbekistan, Turkmenistan), winters in the Middle East and India. Sometimes included in alba.

 Option A: Uzbekistan

 Option B: Russia

 Option C: Haryana

 Option D: Afghanistan

Russia