alfred takes an iq test at ages 25 and 55, measuring his fluid and crystallized intelligence. based on research of their respective developmental trajectories, what are most likely changes in these two areas that we would see? a. his fluid intelligence would decrease with age, whereas his crystallized intelligence would increase. b. both his fluid and crystallized intelligence would increase with age. c. both his fluid and crystallized intelligence would decrease with age. d. his fluid intelligence would increase with age, whereas his crystallized intelligence would decrease.