Answer:
Spearman's theory.
Step-by-step explanation:
General Intelligence or g factor was the theory theorized by Charles Spearman in 1904. Spearman discovered that the 'g factor' is the factor that leads to better performances in the mental ability tests. He developed a statistical technique called factor analysis. With the help of this analysis, researchers are able to measure and number the common abilities of a person. He theorized that if a child scores well in one subject then he will score well in other subjects as well.
So, from the explanation of Spearman's theory of general intelligence, we conclude that Arthur, in the given question, is referring to this model of intelligence. Thus, the correct answer is Spearman's theory.