题目内容：
After the American Revolution won in 1787, the new government in the U. S. A. had to choose a capital city. The thirteen states quarreled about this. So the government decided to build a completely new capital. The land on the River Potomac was given the name District of Columbia ( D. C). The new Capital was built on the north bank of the river. It was named after George Washington, the president of the U. S. A.Washington D. C. , a government city, is an important cultural(文化) center as well as abig tourist (浏览) center.
Most capital cities have simply grown from small cities. Washington, however was plannedas the capital of a great nation. It was designed by a French artist who first made a study of many capital cities of Europe. In general, his plan followed the plan of the beautiful French city of Versailles.
根据以上内容,回答题.
When the new capital was built America was made up of________states. ( ) A．thirty
B．thirteen
C．fifty
D．fifteen
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答案解析：