It is generally accepted that there is such a thing as general intelligence. So which of the following statements is true?

A. Some people have general intelligence, other have multiple intelligences.
B. The only people who do not have general intelligence are those that have IQs less than 100.
C. General intelligence develops by adulthood.
D. General intelligence can be thought of a “mental energy’ that is applied to all tasks that we attempt.

Flynn has shown that there has been a standard deviation increase, per generation, in the mean level of intelligence test performance for most of this country in Western society, which equates to about three IQ points per decade. He believes that such a difference has to be result of which one of the following?

A. An environmental change, because gene frequencies in populations couldn’t change so quickly.
B. Improvements in the gene pool as we evolve.
C. A statistical artefact.
D. None of the above.