Which of the following sets of results shows evidence of proactive interference with a three-trial recall task? (Note: Read the selections as percent correct for Trial 1: Trial 2: Trial 3.) Group of answer choicesa. 20% : 50 % : 70% correct b.80% : 40% : 30% correctc. 30 % : 30% : 30% correct d.70% : 40% : 60% correct