The correct answer is: D. A primary source is typically free of outside interpretation.
To understand the answer, let's first clarify what a primary source is. A primary source can be defined as documents or information that provide a first-hand account or first-hand evidence of a particular matter. In the other words, the information comes from the source itself.
An example of a primary source would be an autobiography of say, Steve Jobs. An autobiography is a considered a primary source, because it provides us with first-hand information from the source itself- in this instance, from Steve Jobs directly. The information in the autobiography is furthermore free of outside interpretation. On the other hand, an observer's interpretation of Steve Jobs' achievements are considered a secondary source, and the information from the observer is not free of outside interpretation.