Mock Juries Benefit Trial Lawyers When the Actual Trial and Jury

Mock juries benefit trial lawyers when the actual trial and jury selection takes place because:

A) profiles developed through the mock jury studies guide the choices for the real case.
B) they provide a respite for lawyers and take on some of their duties during the trial.
C) mock jurors may be asked to join the actual jury if one of the jurors gets sick.
D) mock juries provide little data on actual jury selection but trial lawyers use them anyway.