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].

(CNN) Ronald Reagan's defining leadership moment came in 1987, when he demanded that his Cold War adversary "tear down" the Berlin Wall. John F. Kennedy's happened after the Bay of Pigs disaster in 1961, when he admitted failure in a display of presidential accountability that caused his popularity to soar. And Franklin Delano Roosevelt? His moment came a day after Japan attacked Pearl Harbor. Standing before Congress in his steel leg braces, Roosevelt delivered a speech that made clear America's resilience and declared December 7, 1941 "a date which will live in infamy." Successful presidents are many things, but above all they must be great leaders. They must possess clarity of vision and the communication skills to inspire and unite. Great leaders also surround themselves with strong advisers who have license to speak their minds, and they possess the emotional capacity to connect with the dreams and fears of those they lead.Doug Elmets: After the G20, it is clear President Trump lacks the ability to be a great leaderUnable or unwilling to change, Trump continues to behave as if things should go his way because he said so, writes Elmets 
 Question:But far more often, _ has conducted himself like an imperious adolescent, someone who believes he has all the answers and all the right moves, reality be damned.
Trump