Which of the Following Statements Best Describes the Long-Term Effects

Which of the following statements best describes the long-term effects of large-scale early intervention programs such as Project Head Start?

A) Gains in IQ and academic achievement carry through middle school, high school, and college.
B) Gains in IQ and academic achievement carry through elementary school but steeply decline as a child enters middle school.
C) Gains in IQ and academic achievement are short-lived and generally fade within two to three years after entering school.
D) There have been no studies conducted on the long-term effects of early intervention programs such as Project Head Start.