Which of the following countries is a landlocked country in the Balkans?

Which landlocked country in Asia shares the longest border with India? What is the smallest landlocked country in the world? Which landlocked country in Central Asia has the highest number of natural gas reserves? Which landlocked country in Africa is home to the Okavango Delta? Which African landlocked country has a coastline on Lake Tanganyika? Which landlocked country in South America is home to the Salar de Uyuni? Which European landlocked country is home to the High Tatras mountain range? Which country has the shortest coastline in the world?