A Researcher Has Interviewed 15 Participants

A researcher has interviewed 15 participants. During the last five interviews, the researcher has received confirmation of information gathered in the earlier interviews but has not gained any new information. Which conclusion by the researcher is most reasonable?

A) Data overload has occurred, and the last five interviews can be discarded.
B) Data saturation has been reached, and the researcher does not need to keep conducting interviews.
C) Data are becoming stale, and the researcher needs to find new questions to ask future interview candidates.
D) Data collection is still yielding important information and should continue until the researcher runs out of interview candidates.