Willis and Schaie's Longitudinal Study That Utilized Participants from the Seattle

Willis and Schaie's longitudinal study that utilized participants from the Seattle Longitudinal Study demonstrated that __________.

A) training sessions in spatial orientation and reasoning skills had long-term effects on cognitive performance
B) training sessions in fine and gross motor skills improved the physical health of subjects
C) aerobic exercise and moderate weight training improved muscle mass and increased bone density
D) cognitive functioning would deteriorate regardless of intervention