Answer:
The correct answer is option A.
Step-by-step explanation:
The Flynn defect is a significant and long-sustained improvement in both crystallized and fluid intelligence or IQ test that was assessed in many parts of the world during that time of period.
The Flynn effect is a positive change in the population that arises due to various reasons such as increased access to more children, reduction in the prevalence of malnutrition in children, and advanced in technology.
Thus, the correct answer is option A.