When Predicting a Participant's Y Score from a Linear Regression

When predicting a participant's Y score from a linear regression line, the error in that prediction is.

A) how much the actual score, Y, differs from the mean of the scores, Y
B) the difference between the predicted score, Y ', and the X score used to make the prediction
C) the difference between the predicted score, Y ', and the mean of the predicted scores, Y '
D) how much the actual Y score differs from the predicted Y ' score