A randomly selected sample of 1,000 college students was asked whether they had ever used the drug Ecstasy. Sixteen percent (16% or 0.16) of the 1,000 students surveyed said they had. Which one of the following statements about the number 0.16 is correct:
A. It is a sample proportion. B. It is a population proportion. C. It is a margin of error. D. It is a randomly chosen number.