Why Did the New Government Formed Under the Constitution Move

Why did the new government formed under the Constitution move quickly to pass the Bill of Rights?

A) The newly elected President Washington began to show dictatorial tendencies.
B) Congress was worried that a French-style reign of terror might occur in America.
C) Many states had ratified the Constitution with the understanding that it would soon be amended to include guarantees of individual rights.
D) Western expansion required a firmer statement of individual rights in federal territories.
E) Congress wanted to amend the Constitution quickly to show that it was not meant to be unchangeable.