Which of the Following Is NOT a Proposed Explanation for the Flynn

Which of the following is NOT a proposed explanation for the Flynn effect?

A) People are getting more nutrition in their diets now than before.
B) The modern world is becoming increasingly complex,requiring more learning and problem-solving skills.
C) Modern popular culture has become more challenging for consumers than in previous generations.
D) IQ scores have been increasing around the world over the last century.
E) The amount of education required for jobs has increased for both men and women.