ARaymond Cattell
BBinet
CPavlov
DSkinner
Answer:
A. Raymond Cattell
Read Explanation:
Psychologist Raymond Cattell introduced the concepts of fluid and crystallized intelligence in 1943.
Cattell's theory was based on the idea that general intelligence (g) is made up of fluid and crystallized intelligence (gf and g c).
Fluid intelligence
The ability to think flexibly and critically about new situations, and to solve problems without relying on prior knowledge. Fluid intelligence is often measured through problem-solving tests. It's thought to peak in late adolescence or early adulthood, and then decline with age.
Crystallized intelligence
The ability to use knowledge and experience that's been acquired over time. Crystallized intelligence is often measured through aptitude tests like the SAT, C-test, and MCAT. It increases throughout life, as more information is stored in memory.