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The correct answer is option 4, Tajikistan.
Option 1, North Korea, is not the correct answer because North Korea has not joined the World Trade Organization as of March 2013.
Option 2, China, is not the correct answer because China joined the World Trade Organization in December 2001, making it one of the earlier countries to join.
Option 3, Russia, is not the correct answer because Russia joined the World Trade Organization in August 2012, making it also not the latest nation to join as of March 2013.
Option 4, Tajikistan, is the correct answer because Tajikistan joined the World Trade Organization on 2 March 2013. Therefore, as of March 2013, Tajikistan is the latest nation to join the World Trade Organization.
It is important to note that the information given is accurate as of March 2013, and the status of countries joining the World Trade Organization may have changed since then.