Bernard Is Now 80 Years Old

Multiple Choice

Bernard is now 80 years old.When he was 20 years old he took part in a detailed study that assessed various aspects of his intellectual functioning.If Bernard were to complete the same tests today,he would MOST likely discover that

A) his fluid intelligence has declined over time, but his crystallized intelligence has remained stable.
B) both his fluid and crystallized intelligence have declined over time.
C) his crystallized intelligence has declined over time, but his fluid intelligence has remained stable.
D) his fluid intelligence has remained stable over time, and his crystallized intelligence has increased.