Why are older adults more likely to forget what items they wanted to buy at a grocery store (unless they write them down on a list and take it with them) than they are to forget how to drive a car? a. implicit memory is less likely to be adversely affected by aging than explicit memory. b. perceptual speed declines with aging. c. explicit memory declines more rapidly with aging than implicit memory. d. source memory is more likely to decline with aging than prospective memory?