Final answer:
Susan is using crystallized intelligence when she uses a formula to calculate the area of a geometric figure.
Step-by-step explanation:
The answer to Susan's question is b) Crystallized intelligence. When Susan uses a formula to calculate the area of a geometric figure, she is using crystallized intelligence. According to psychologists, crystallized intelligence refers to acquired knowledge and the ability to retrieve it. It involves demonstrating mastery of information covered in the course, which is exactly what Susan does when she uses a formula to calculate the area.