Research studies have shown the existence of age-related cognitive changes in late adulthood. Which of the following statements supports this claim?

A) Although older adults usually do not fare as well as younger adults in tasks that measure implicit memory, they tend to do nearly as well as young adults in tasks that assess explicit memory.
B) If fluid intelligence remains intact, prospective memory of older adults does not decline.
C) Older adults show a gradual decline in their expressive vocabularies despite retaining their receptive vocabularies.
D) When older adults encounter interpersonal conflicts, they are relatively more likely than young adults to express frustration and to seek support from other people.

C