If in a Single-Subject Study, What Does It Mean If

Multiple Choice

If in a single-subject study, what does it mean if the percentage of nonoverlapping data (PND) is 50%?

A) The result is statistically significant.
B) Half the responses made by the participant are "good" responses and the other half are "bad" responses.
C) There is a 50% chance that the participant will exhibit the target behavior on any given observation.
D) Half the responses in the treatment condition are more extreme than the most extreme response in the baseline condition.