What results were concluded by the study conducted by regarding group training of ABA knowledge competencies by Luiselli et al. (2007)? a. Average tests scores for the three ABA competencies decreased from pretraining to posttraining. b. Average tests scores for the three ABA competencies remained the same from pretraining to posttraining. c. Average tests scores for the three ABA competencies increased from pretraining to posttraining. d. Average tests scores for only one ABA competencies increased from pretraining to posttraining. e. Average tests scores for the three ABA competencies were halved from pretraining to posttraining