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.

Let me give you an example: 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
The answer to this example can be: (F)
Here is why: This is a good example. Based on the passage, any cubs will return to China at the age of two

OK. solve this:
FOB Tillman, Afghanistan (CNN) -- U.S. troops have fired into Pakistani territory at least four times in the last 10 months in cross-border skirmishes that they say are in response to shelling from inside Pakistan, CNN has learned. The revelation is likely to stoke already tense relations between Pakistan and the United States, which hit a new low after a NATO airstrike last year killed 24 Pakistani soldiers along the volatile border. While the Taliban and Haqqani network, an Afghan militant group operating from Pakistan's Waziristan province, are generally believed responsible for cross-border attacks against troops, an Afghan army commander says Pakistani soldiers opened fire on him and his men as recently as April 14.An Afghan commander accuses Pakistani soldiers of firing across the borderPakistani military spokesman confirms U.S. troops have fired across borderNATO says a base near the border has fired into Pakistan four times since JuneA U.S. official says they try to liaise with Pakistani military forces first 
 Questions:The outpost is one of a handful along the _-Pakistan border, and the captain's admission may indicate more cross-border violence than previously publicized. (A) FOB Tillman (B) Afghanistan (C) CNN (D) U.S. (E) Pakistani (F) Pakistan (G) United States (H) NATO (I) Taliban (J) Haqqani network (K) Waziristan
Answer:
(B)