单选题：Who is Uncle Sam?“Uncle Sam”, of course, stands for the Unit

Who is Uncle Sam?
“Uncle Sam”, of course, stands for the United States. It is the nickname(绰号) of the country. It is hard to believe that this nickname arose quite by accident and there was a man called “Uncle Sam ”46
The man was called Uncle Sam Wilson. He was born in Arlington, Massachusetts (马萨诸塞州), September 13,1766. At the age of 14 Sam joined the American Revolutionary War, and served in the army under George Washington until the end of the war. He then moved to Troy, New York State and began a meat-packing business in the year 1812 war broke out between the United States and Great Britain. 47. Among them was Governor Daniel Tomp-kings of New York State. He noticed the capitalized letters EAUS on the packages of meat and asked what they stood for. A workman replied that EA stood for Elbert Anderson, the businessman for whom Sam was working.48. In May 1813, this story appeared in a newspaper published in New York.49
By the end of the War of 1812, “Uncle Sam” had come to symbolize (象征)the character of the nation and the government.50
A　And he added jokingly that US (actually it was the short form for the United States stood for Uncle Sam Wilson.)
B　However, not many people have ever heard of such a man. Not even most young Americans.
C　He did his bit to support the American army.
D　In 1961 the US Congress(国会) made a decision that “Uncle Sam” is the America's national symbol.
E　On October 2 that year, a group of visitors came to Sam's meat-packing plant.
F　Since Uncle Sam was an example of a hard-working man and a lover of America, the idea of “Uncle Sam” as the name for this kind of man became well-known rapidly.
回答第46空。