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.

Jack Dorsey would have to give up his post at Square if he wants to become permanent CEO of Twitter. The company he helped found and now leads on an interim basis said Monday that it is only considering candidates who can make a 'full-time commitment to Twitter.' Dorsey was named interim CEO after Dick Costolo stepped down effective July 1 amid criticism over Twitter's disappointing financial performance and share price decline. Costolo had been Twitter's CEO for five years and led the company through a successful stock market debut in 2013. But Twitter has yet to make a profit and there are concerns about its ability to grow its user base.Costolo stepping down from his role beginning July 1Costolo faced controversies over online abuse and user numbersBoard only considering candidates who can make 'full-time commitment' 
 Questions:Costolo has agreed to cancel all of his remaining unvested equity in _ after July 1 as part of today's deal. (A) Jack Dorsey (B) Square (C) Twitter (D) Dorsey (E) Dick Costolo (F) Costolo (G) Board
(C)

Washington (CNN) Donald Trump said Sunday that Russian President Vladimir Putin won't make a military move into Ukraine -- even though Putin already has done just that, seizing the country's Crimean Peninsula. "He's not going into Ukraine, OK, just so you understand. He's not going to go into Ukraine, all right? You can mark it down. You can put it down. You can take it anywhere you want," Trump said in an interview on Sunday with ABC's George Stephanopoulos on "This Week." "Well, he's already there, isn't he?" Stephanopoulos responded, in a reference to Crimea, which Putin took from Ukraine in early 2014.Donald Trump insisted Russia's Vladimir Putin is 'not going to go into Ukraine'Putin did just that in 2014, seizing Ukraine's Crimean peninsula 
 Questions:And he argued that the conflict over Crimea was the fault of the Obama administration, writing: "So with all of the Obama tough talk on _ and the Ukraine, they have already taken Crimea and continue to push. (A) Washington (B) CNN (C) Donald Trump (D) Russian (E) Vladimir Putin (F) Ukraine (G) Putin (H) Crimean Peninsula (I) OK (J) Trump (K) ABC (L) George Stephanopoulos (M) This Week (N) Stephanopoulos (O) Crimea (P) Crimean peninsula
(D)

An attack of the giggles can sometimes appear at the strangest moments. Whether it's during a speech or in a meeting, helpless laughter is one of our most insightful behaviours, according to neuroscientist Sophie Scott. In a recent Ted Talk in Vancouver, Professor Scott revealed that laughter often isn't to do with comedy value, but with our relationships with others. Laughter is often used as a tool for social bonding rather than in reaction to something that has comedy value, according to UCL Professor Sophie Scott. Pictured are Prime Minister David Cameron and US President Barack Obama during a basketball gameProfessor Sophie Scott says laughter often isn't to do with comedy valueIn a conversation, the person who laughs most is usually the one talkingPeople are 30 times more likely to laugh if they are with someone elseIt also triggers brain's mirror region which explains why it is contagious 
 Questions:_ activates the brain's mirror regions that mimic other's actions, and she says this is the reason behind why laughing can be so contagious. (A) Sophie Scott (B) Ted Talk (C) Vancouver (D) Scott (E) Laughter (F) UCL (G) David Cameron (H) US (I) Barack Obama

(E)