You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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
Solution: (F)
Why? This is a good example. Based on the passage, any cubs will return to China at the age of two

New input: (CNN) -- Two Las Vegas police officers were were shot and killed along with a civilian bystander late Sunday morning by a gun-toting duo declaring "revolution," authorities say. Las Vegas Metropolitan Police spokeswoman Laura Meltzer says the attackers -- one male and one female -- opened fire inside of a CiCi's Pizza location at 11:30 a.m, killing the officers as they ate lunch, she said. Clark County Sheriff Douglas Gillespie identified the slain officers as 41-year-old Alyn Beck and 31-year-old Igor Soldo. Beck, a 13-year LVMPD veteran, leaves behind a wife and three children. Soldo, who also leaves behind a wife and baby, joined the force in 2006.Two gunmen kill two police officers, another person and themselves, police sayThe two officers were attacked while they ate lunch, police sayAnother person was killed in front of a Walmart entranceWitnesses told police that the shooters said: "This is a revolution." 
 Questions:After killing the officers, _ said the pair then went across the street and into a Walmart, where they killed a female at the store's entrance. (A) CNN (B) Las Vegas (C) Metropolitan Police (D) Laura Meltzer (E) CiCi's Pizza (F) Clark County (G) Douglas Gillespie (H) Alyn Beck (I) Igor Soldo (J) Beck (K) LVMPD (L) Soldo (M) Walmart
Solution:
(D)