With respect to intelligence testing in adulthood,scores on items measuring fluid intelligence _____ with age,and scores on items measuring crystallized intelligence _____ with age.

A) increase;increase
B) decrease;decrease
C) decrease;increase
D) increase;decrease

Fluid intelligence refers to the ability to think abstractly, reason, identify patterns and problem solve, which tends to decline with age. On the other hand, crystallized intelligence refers to acquired knowledge and skills, which tend to increase with age due to lifelong learning and experiences.