The North Atlantic Treaty Organization (NATO) is an international alliance that consists of 30 member states from North America and Europe. The correct answer to the question is option 3, Belarus.

Let`s explain each option:

1. Hungary: Hungary is a NATO member. It joined NATO on 12th March 1999.

2. Poland: Poland is also a NATO member. Just like Hungary, it joined NATO on the 12th of March in 1999.

3. Belarus: Belarus, the correct answer, is not a NATO member. It has pursued a policy of neutrality & has developed partnerships with NATO, but it has not fully joined the coming.

4. Turkey: Turkey is a NATO member too. It became a member earlier than the previous two options on 18 February 1952.

So, all states except Belarus are members of NATO.