Which of these countries is "doubly landlocked" (surrounded entirely by one or more landlocked countries)?

The answer is Uzbekistan because it is the only country in the world that fits the definition of being doubly landlocked, which means a landlocked country that is entirely surrounded by other landlocked countries. Uzbekistan is bordered by Kazakhstan to the north, Kyrgyzstan and Tajikistan to the east, Afghanistan to the south, and Turkmenistan to the southwest. All of these neighboring countries are themselves landlocked, making Uzbekistan the only country that fulfills the criteria of being doubly landlocked.