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].

[Q]: We're not bluffing, the Obama administration told Afghanistan on Tuesday in announcing for the first time it has started planning for the possible withdrawal of all U.S. troops by the end of the year if no security agreement is signed. Statements by the White House and Defense Secretary Chuck Hagel showed President Barack Obama's impatience with Afghanistan President Hamid Karzai's refusal to sign the agreement that would keep several thousand American troops in the country after combat operations conclude this year. In a phone call with Karzai on Tuesday to discuss upcoming elections for a new Afghan leader, Obama made clear that time was running out to properly plan for keeping any U.S. forces in the country beyond 2014, the White House said.President Obama calls Afghan leader to discuss security agreementObama orders planning for bringing home all U.S. troops at the end of 2014Afghan President Karzai refuses to sign a deal to keep some troops thereThe White House says an agreement could happen after Karzai leaves office in April 
 Question:Obama, he said, has been very clear that the possibility of U.S. troops staying in Afghanistan depends "on whether we have a bilateral security agreement signed by the Afghani government, to assure our rights of our troops and other important elements that are required any time _ has troops in another country."
[A]: U.S.


[Q]: (CNN) The Syrian rebels' assault on regime-held parts of Aleppo keeps getting deadlier, with 84 people killed over the past three days, the Syrian military said Monday. The latest violence also wounded 280 people in western Aleppo, Syria's General Command of the Armed Forces said. Syrian rebels have intensified attacks on western Aleppo to try to break the regime's siege of opposition-held eastern Aleppo, which has been choked off from food, fuel and other necessities. The military said rebels fired more than 100 mortars and launched 50 rockets. It also accused rebels of using chlorine gas on civilian areas, saying there were 48 cases of breathing difficulties.Syrian rebels have stepped up attacks to try to break the regime's siege of rebel-held eastern AleppoA UN envoy says he's "appalled" by the number of rockets indiscriminately launched by armed opposition 
 Question:The regime, too, has been accused of indiscriminately attacking civilians in _.
[A]: Aleppo


[Q]: (CNN) This time it was a "March for Truth." Thousands of protesters took to the streets Saturday from New York to San Diego, calling for an impartial investigation into alleged Russian interference in the 2016 presidential election and possible ties with members of the Trump campaign. The march was the latest in a series of national protests -- from support for women's rights to opposition to new immigration policies -- since the inauguration of President Donald Trump in January. "We recognize that protest is the new brunch," quipped Ben Wikler, Washington director of MoveOn.org, who joined several hundred protesters near the Washington Monument in the nation's capital."I served in the US Navy for 22 years to defend the Constitution, not Donald Trump's financial interests," protesting Navy vet says"We have your back!" Trump supporters chant in their own demonstration for the President 
 Question:The '_' is to tell them we know what truth is from lying."
[A]:
March for Truth