Which example describes a secondary source?
a. a vase created during the height of the roman empire
b. the transcript of a speech given by a roman emperor.
c. a letter written in 10 ce by roman emperor augustus
d. a textbook describing the fall of the roman empire

Among the options given on the question the correct answer is option D.

A textbook describing the fall of the Roman Empire.

Explanation: There are tow king of source in literature. They are primary and secondary source. The primary source is the first hand information which means that the writer is involved with the incident,or the writer is the eye witness. So,the option A ,' a vase created during the height of the roman empire' is a primary source. The option b is the transcript of the speech of Roman emperor is also a primary source.Moreover, the option  C is the letter written by the roman emperor is also a primary source.Because all of them are first hand information.

But the describing of the fall of Roman empire in the textbook is a secondary source. Because secondary source means the information is gathered from another source. We know that the textbook is not a original collection of information. The information is gathered from another primary source.

Therefore the answer is option D.

although the legal justifications for the trials and their procedural innovations were controversial at the time, the nuremberg trials are now regarded as a milestone toward the establishment of a permanent international court, and an important precedent for dealing with later instances of genocide and other crimes