Given the task definition, example input & output, solve the new input case.
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: 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
Output: (F)
This is a good example. Based on the passage, any cubs will return to China at the age of two

New input case for you: (CNN) The White House moved to tamp down suggestions that ties with Saudi Arabia are fraying, with administration officials saying that President Barack Obama "really cleared the air" with King Salman at a meeting Wednesday. Yet even as White House officials stressed that the leaders made progress, a prominent member of the Saudi royal family told CNN "a recalibration" of the U.S.-Saudi relationship was needed amid regional upheaval, dropping oil prices and ongoing strains between the two longtime allies. Obama landed in Riyadh earlier Wednesday for a summit with Gulf leaders and spent two-and-a-half hours meeting with the 80-year-old monarch on issues that have recently strained the alliance, including the conflict in Yemen, the role of Iran, Lebanon's instability and the fight against ISIS, U.S. officials said.The U.S and Saudi Arabia aren't at the end of a love affair, so much as in an unhappy marriageThe two countries are bound by military links and a shared fight against terrorism 
 Questions:But the two leaders glossed over some of the thorniest matters, including a Saudi threat to dump U.S. assets if _ signs into law a bill that could make the kingdom liable for damages stemming from the September 11 terror attacks. (A) White House (B) Saudi Arabia (C) Barack Obama (D) Salman (E) Saudi (F) CNN (G) U.S (H) Riyadh (I) Gulf (J) Yemen (K) Iran (L) Lebanon (M) ISIS (N) U.S.
Output:
(C)