The correct answer is the following: option d. Out of all the sources provided in the question, an inauguration speech by the elected official would be an example of a primary source.
A primary source are documents that provide first-hand accounts of the event that is being researched. These documents are created by either the protagonist of the event itself, or by a witness or first recorders that were present at that moment and time. That is why an inauguration speech by the elected official would be considered a primary source, because it is a first hand account of that event.
