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. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

[EX Q]: (CNN) Khuram Shahzad Butt, a 27-year-old British national born in Pakistan who died in a hail of police bullets Saturday night after the London attack, was a tall, lanky, straggly bearded young man of few words -- a brainwashed follower of al-Muhajiroun, a loose grouping of British extremists supportive of ISIS linked to a large number of terrorist plots involving UK nationals. The latest on London attack CNN's Sandi Sidhu met him several times while reporting on the group in the United Kingdom between 2014 and 2016. He went by the name "Abz" or "Abu Zaitun" and seldom spoke during meetings. He was content to leave the task of proselytizing to louder, older members of the group, according to Sidhu.London attacker Khuram Shahzad Butt appeared in a 2016 Channel 4 documentary called "The Jihadis Next Door"At the time of the attack, Butt worked as a receptionist at a fitness center in Ilford, a friend from the gym said 
 Question:The identification of Butt as one of the attackers raised many questions about what _ authorities knew about him and when.
[EX A]: British

[EX Q]: This is the moment a group of terrified African migrants were photographed clinging on for dear life after the barely seaworthy boat they were using to make the extremely dangerous passage across the Mediterranean Sea began to sink. More than 450 migrants desperate for a new life in Europe were crammed on board the former fishing vessel when it went down just 20 miles off the northern coast of Libya. Only the lucky few seen in the photographs - which were taken from a passing aircraft - were able to survive the disaster, clinging to the tiny tip of the hull that remained above the water after hundreds of their friends and family members sunk to their tragic deaths.More than 450 migrants desperate for a new life in Europe were crammed on board the former fishing vesselThe boat bound for the Italian mainland went down just 20 miles off the northern coast of LibyaOnly a lucky few seen in the photographs were able to survive the disaster - with hundreds of others dyingPassengers on board a passing plane were able to alert the Italian Coast Guard who sent a rubber dinghyBut that craft was overwhelmed by the desperate migrants and also started to sink in the merciless sea 
 Question:Most aim to make their way to the more prosperous countries of _'s center and north.
[EX A]: Europe

[EX Q]: (CNN) -- Like Amanda Berry, who ran to freedom Monday after years in captivity, Tonia Carmichael was abducted and held by a male captor not far from her Cleveland home. Berry, whom police took to safety along with two other women they rescued from a home at 2207 Seymour Ave., could be seen healthy and beaming in a photo snapped Monday at an area hospital. She endured 10 years of confinement, but her life will go on. Carmichael was less fortunate. Her life and those of 10 others ended just over five miles away in the notorious "House of Horrors," at 12205 Imperial Ave., at the hands of convicted sex offender Anthony Sowell, who had moved to the address after serving 15 years in prison for attempted rape.The abductions of women freed Monday have things in common with the "House of Horrors"In October 2009, 11 female bodies were discovered at one man's propertyThe women in both cases had things in common with each otherIn both cases, the abductions occurred in a neighborhood the women knew 
 Question:_, who was 52 when she vanished, had routinely left home for days or weeks at a time.
[EX A]:
Tonia Carmichael