C) The day Japan bombed Pearl Harbor
Japan bombed Pearl Harbor, Hawaii during World War II.  It was the largest attack on American soil to date, and it was viewed as an act of war.  It directly led to the U.S. entering into World War II.  
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The correct answer is the fourth option. 
Sun Yat-sen is one of the most important 20th century Chinese political figures. He is hailed as a "father of the nation" but his career was tumultuous one. He was instrumental in overthrowing the Qing dynasty  but after the second revolution because of the Tongmenghui he had to flee but was for a short time imprisoned in Britain where he was in exile by the Chinese who recognized him. 
        
             
        
        
        
Answer:
offer to remove the Cuban missiles in exchange for the U.S. promising not to invade Cuba.
Explanation:
Following this news, many people feared the world was on the brink of nuclear war. However, disaster was avoided when the U.S. agreed to Soviet leader Nikita Khrushchev's (1894-1971) offer to remove the Cuban missiles in exchange for the U.S. promising not to invade Cuba.