Q: 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.
Aerzen, Germany (CNN) In a cold world, President Barack Obama has found some warmth in Germany. For the famously reserved commander in chief, German Chancellor Angela Merkel has become his closest global partner, an alliance-turned-friendship forged by mutual political interests and parallel personalities. Obama arrived in Hanover, Germany, on Sunday to lend Merkel his backing as she faces political blowback over her stance on refugees fleeing war in Syria, a position Obama praised as a matter of moral fortitude. "She's on the right side of history on this," Obama said alongside his German counterpart Sunday, praising Merkel for confronting some "very tough politics" in opening her country's borders to nearly a million migrants last year.President Barack Obama is in Germany on SundayHe will lend support to German Chancellor Angela Merkel 
 Questions:Finally, _'s chief of staff was dispatched to the German capital to resolve the tensions, a rare overseas mediation that was effective in cooling tempers. (A) Aerzen (B) Germany (C) CNN (D) Barack Obama (E) German (F) Angela Merkel (G) Hanover (H) Merkel (I) Syria
A:
(D)