Wood and Cowan Switched a Passage in Participants' Unattended Ear

Wood and Cowan switched a passage in participants' unattended ear to backward speech and reported that performance in shadowing the other ear ______.

A) was unaffected for all participants
B) included more errors for all participants during the time that the backward message was being played
C) included more errors for only the participants who did not notice the backward message
D) included more errors that peaked 10 to 20 seconds after the backward message began,for those that did notice the message