Approved April 24, 1800, the act of Congress that made provision for the removal of the government of the United States to the new federal city, Washington , D.C., also established the Library of Congress.
A.Approved April 24, 1800, the act of Congress that made provision for the removal of the government of the United States to the new federal city, Washington , D.C., also established
B.The act of Congress, which was approved April 24, 1800, making provision for the removal of the government of the United States to the new federal city, Washington , D.C., also established
C.The act of Congress approved April 24, 1800, which made provision for the removal of the government of the United States to the new federal city, Washington , D.C., and established
D.Approved April 24, 1800, making provision for the removal of the government of the United States to the new federal city, Washington , D.C., the act of Congress also established
E.Approved April 24, 1800, the act of Congress made provision for the removal of the government of the United States to the new federal city, Washington , D.C., also establishing
which非限制修饰，比如B选项 'The act of Congress, which was approved April 24, 1800', 之所以不正确是因为，which部分修饰了国会立法案。
国会立法案是一个统称概念，不能说国会立法案在1800年颁布，应该说“具体的”某个国会立法案在1800年颁布。这个就是具体的某个国会立法案：the act of Congress that made provision for the removal of the government of the United States to the new federal city。