When assessing intelligence, what does 'fluid intelligence' primarily involve?

Fluid intelligence primarily involves reasoning and abstract thinking. This form of intelligence allows individuals to solve novel problems and think critically in unfamiliar situations, independent of any prior knowledge. It encompasses the ability to identify patterns, make connections between ideas, and apply logical reasoning to arrive at solutions.

This concept contrasts with crystallized intelligence, which pertains to the knowledge and skills gained through experience and education, such as vocabulary and factual knowledge. While other options may touch on related skills, such as practical problem-solving or verbal skills, they do not specifically capture the essence of fluid intelligence as the ability to think logically and abstractly about new information or problems.