Studies Testing the Effectiveness of Judge's Instructions to the Jury

Studies testing the effectiveness of judge's instructions to the jury to disregard pretrial publicity have found:

A) no effect of such instructions on jurors' decision making in passing a guilty verdict.
B) that jurors were able to mostly ignore the media accounts they had been exposed to.
C) jurors to be able to disregard pretrial publicity in civil cases only.
D) jurors to be able to disregard pretrial publicity in murder cases only.