I think it's D I don't know if it's correct
It has been declined since 1960s
This declines in marital rates forced a lot of children have to live within a single parents household. Which make them forced to experienced a really harsh condition where they have to face economic difficulty from income perspective and unfulfilled need for affection because the single parents is forced to be away from work and couldn't pay attention to the children.
Answer:
The Flynn effect
Explanation:
The Flynn effect is an effect that has been observed and it refers to the rise over time in standardized intelligence test scores.
In other words, this effect refers to the tendency of IQ scores to change over time, by increasing in the general population in an steady rate when taking IQ tests.
In this example, a team of researchers has been tracking performance on intelligence tests over the last 70 years, and they have found that their sample has been subject to the Flynn effect, indicating that intelligence test performance has been improving.
What are the events listed
