Answer:
b. increasingly improved childhood health and nutrition
Step-by-step explanation:
It would be reasonable to suggest that the Flynn effect is due in part to increasingly improved childhood health and nutrition.
Flynn effect is refer to the observed rise over time in standardized intelligence test scores i.e a secular increase in population intelligence quotient (IQ) observed over time, this observation was documentation by James Flynn in 1984, increase in IQ scores can be due to improvements in education and better nutrition.