Suppose the U. S. Senate passes an important law to be used by the U. S. military service. If you were researching the history of this law, which of the following documents would provide a more valid account of the Senate's decision-making process?
A. a speech by one of the senators, given after the law passed
B. notes led by a stenographer (record-keeper) in the U. S. Senate
C. a blog entry written by a soldier in the U. S. army
D. a news story by a reporter who lives near Washington, D. C.