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) The cavalry is coming! Not exactly, but the sentiment of reassurance is the same. This week, US Defense Secretary James Mattis arrives in Asia to visit South Korea and Japan. Two stalwart US allies, policymakers in both capitals have nevertheless been shaken by statements Donald Trump made while campaigning for President. None of these was more dramatic than the suggestion that these allies should pay more for US troops or risk having these forces withdrawn. Statements like this played to the worst fears in Seoul and Tokyo that the United States might no longer be a committed ally. It is now Mattis' job to reassure them of US commitments and return the trajectory of alliance relations back to pre-2016 presidential campaign rhetoric.Jeffrey Hornung: Japan, South Korea were shaken by statements Donald Trump made while campaigningWashington's alliances with Seoul and Tokyo will be critical in managing challenges posed by China and North Korea, he says 
 Question:Given the severity of the _ threat, it is crucial they hammer out any possible differences that may have arisen since Trump became president.
[EX A]: North Korea

[EX Q]: Barcelona took a major step towards qualification for the last four of the Champions League after they dismantled Paris Saint-Germain on Wednesday night. Sportsmail's ADAM CRAFTON takes a look at five things we learned from Barcelona's emphatic  victory. Super Suarez It feels rather strange now but there was a time last summer when we were all wondering whether Luis Suarez - with his penchant for a human-based snack during football matches - was worth all that money for Barcelona. There can be no question anymore. It is now 17 goals for the season and Barcelona's front three, spearheaded by Suarez, Lionel Messi and Neymar is the most in-form in world football.Luis Suarez scored a brace while Neymar also netted in 3-1 win at PSGSuarez has 17 goals for the season after slow start to life at the Nou CampSuarez, Lionel Messi and Neymar is the best front three in world footballPSG missed Zlatan Ibrahimovic's world-class qualities in their defeat 
 Question:_ scores his second of the night to give Barcelona a 3-0 lead in their tie at Paris Saint-Germain.
[EX A]: Luis Suarez

[EX Q]: (CNN) Last week, the American-backed Syrian Democratic Forces announced that it had taken Raqqa, the Syrian city, which had served as ISIS' capital. The taking of the city is the latest in a series of substantial military blows to ISIS' fortunes. However, Americans should not expect the fall of Raqqa to have a substantial effect on the jihadist threat at home. The threat posed by ISIS to the United States has long come primarily from its ability to inspire and enable attacks -- and not from its territorial holdings in Syria and Iraq. Since ISIS burst onto the global scene in 2014, seven individuals motivated by jihadist ideology have killed 74 people inside the United States in six attacks, according to New America's research. Though they may have been inspired by ISIS, none of those attacks were carried out under direct command by the group, and none of the deadly attacks involved a fighter who had returned from Syria or Iraq.David Sterman: Although the fall of Raqqa is a military blow to ISIS, the group and its ideology still remain a threat to the USISIS is quite effective at inspiring and enabling attacks thousands of miles from its base 
 Question:Although there have been non-lethal attacks and foiled plots in which the plotters communicated with _ militants abroad.
[EX A]:
ISIS