Spearman Proposed the Concept of G After He Found That

Multiple Choice

Spearman proposed the concept of g after he found that

A) test items differed in the extent to which they predicted cognitive performance outside of the testing situation.
B) crystallized and fluid intelligence are easy to distinguish in factor analysis.
C) all test items he examined correlated with one another.
D) separate, unrelated factors, called primary mental abilities, exist.