Read the excerpt and then answer the question that follows.
"The average case cost to process DNA from the time the evidence was sent to the lab until an arrest was $1,397; there was little variation in costs, except that outsourcing (sending samples to a private laboratory) was more expensive."
Courtesy of the United States Department of Justice
Which of the following criteria does the author use in this excerpt?
 A. assumption
 B. reasoning
 C. evidence
 D. viewpoint