Because of his accumulated years of knowledge about psychology, dr. hernandez has decided that his fiftieth birthday would be the perfect time to begin writing an introductory psychology textbook. it would demonstrate his
a. factor analysis
b. fluid intelligence
c. predictive validity
d. crystallized intelligence

It would demonstrate his crystallized intelligence

Explanation:

Crystallized intelligence includes knowledge that arises from previous learning and former practices. Reading comprehension and vocabulary exams involve conditions that need crystallized intelligence. Crystallized intelligence is the strength to practice the knowledge that was earlier earned through study and activity.

You employ crystallized intelligence when you face responsibilities that want the application of beforehand obtained knowledge.  As we mature and incorporate new knowledge and intelligence, crystallized intelligence enhances more powerful. The more accumulated knowledge you have, the more crystallized intelligence you will possess. Here based on his experience knowledge he planned to write a book.

i think it's the cabinet