In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

Example input: For four years we have waited expectantly for the pitter patter of tiny paws. Soon, that wait could finally be over. Tian Tian, the UK's only female giant panda, has conceived and could give birth to a cub as early as August. However Edinburgh Zoo, where the pandas live, have warned people 'not to get too excited' as the process is 'extremely complex'. Moreover, on the two previous occasions keepers inseminated Tian Tian - whose name means 'Sweetie' - she has failed to produce a panda cub. She was artificially inseminated again in March this year, but keepers at the zoo say implantation - when a fertilised egg attaches to the uterus - has not yet occurred.Tian Tian has conceived and could give birth to a cub as early as AugustShe has been inseminated twice before but so far failed to produce a cubTian Tian and Yang Guang arrived in 2011 from China to great fanfareOn loan at £600k a year, became first giant pandas to live in UK for 17 years 
 Questions:Under the terms of the agreement any cubs will return to _ at the age of two, the age at which they would normally leave their mother in the wild. (A) Tian Tian (B) UK (C) Edinburgh Zoo (D) Sweetie (E) Yang Guang (F) China
Example output: (F)
Example explanation: This is a good example. Based on the passage, any cubs will return to China at the age of two
Q: (CNN) US troops have deployed to Bulgaria as part of a NATO operation to support Eastern European allies from potential aggression by Russia, the Bulgarian Ministry of Defense said in a statement. The move is the latest in a series of multinational training and security cooperation activities along the alliance's eastern front. It comes at a tenuous time in the relationship between the Kremlin and the fledgling administration of President Donald Trump, who just last week voiced unusually strong support for NATO after repeatedly objecting to its relevancy and funding. One hundred twenty troops from the 3rd Armored Brigade Combat Team, 4th Infantry Division, from Fort Carson, Colorado, arrived Wednesday at the Novo Selo training range in eastern Bulgaria, according to the Bulgarian statement. They're due to be joined by heavy military equipment and armored vehicles by the end of the week.More than 100 service members from Colorado now part of missionDeployment comes as Trump, often critical of NATO, affirms US commitment 
 Questions:It is with this aim that _ continues its expansion," Putin said. (A) CNN (B) US (C) Bulgaria (D) NATO (E) Eastern European (F) Russia (G) Bulgarian (H) Ministry of Defense (I) Kremlin (J) Donald Trump (K) 3rd Armored Brigade Combat Team (L) 4th Infantry Division (M) Fort Carson (N) Colorado (O) Novo Selo (P) Trump
A:
(D)