Match List - I with List - II:

List I	List II
A. Spearman	III. Two-Factor Theory
B. Thurstone	II. Primary Mental Abilities
C. Gardner	I. Multiple Intelligence
D. Cattell	IV. Fluid vs. Crystallized Intelligence

Correct option is D

The correct matching is based on the major theories of intelligence proposed by these psychologists:
    A. Spearman – Two-Factor Theory (III): Spearman proposed the g-factor (general intelligence) and s-factor (specific abilities), forming the two-factor theory.
    B. Thurstone – Primary Mental Abilities (II): Thurstone identified seven primary mental abilities, such as verbal comprehension and numerical ability, opposing Spearman's single g-factor.
    C. Gardner – Multiple Intelligence (I): Gardner introduced the theory of multiple intelligences, including linguistic, logical-mathematical, spatial, musical, and interpersonal intelligences, among others.
    D. Cattell – Fluid vs. Crystallized Intelligence (IV): Cattell differentiated between fluid intelligence (problem-solving ability) and crystallized intelligence (knowledge acquired through learning and experience).