Which Statement Best Summarizes the Research Findings of Longitudinal Studies

Which statement best summarizes the research findings of longitudinal studies that have assessed the intelligence quotient (IQ) of children that have participated in compensatory education programs in comparison to those children who did not?

A) They have lower initial IQ scores but then show gains.
B) They do not show any significant short-term or long-term changes to their initial IQ scores.
C) They have higher IQ scores throughout the elementary and high school years.
D) They have higher IQ scores in the short-term, but then show a decline.