Conducting a nuanced analysis of the theories of intelligence and the history of their measurement, which of the following statements is most authoritative and scientifically valid regarding the conceptual and operational dynamics of Charles Spearman's 'Two-Factor Theory', Howard Gardner's 'Theory of Multiple Intelligences', and the first intelligence test developed by Alfred Binet (Binet-Simon Scale, 1905)?

Understanding Intelligence Theories and Measurement

Alfred Binet and Theodore Simon developed the first successful intelligence test in 1905. The concept of Mental Age was introduced by Binet, and it was later refined by the German psychologist William Stern in 1912, who formulated the concept of Intelligence Quotient (IQ) using the formula: $(Mental Age / Chronological Age) \times 100$.

Analysis of Incorrect Options

• Option A: Spearman's 'g-factor' is generally considered by psychometricians to be relatively stable and innate, rather than easily modifiable through standard training.
• Option C: Gardner's theory explicitly argues that multiple intelligences are relatively autonomous and independent of each other.
• Option D: Spearman's 's-factor' is specific to a particular task and possesses varying degrees of innate and acquired components, not purely environmental.