Which of the Following Statements About School and Intellectual Development

Which of the following statements about school and intellectual development is true?

A) Children whose birthdays allow them just make the cut-off for school attendance tend to struggle more than children who do not make the cut-off and are almost a year older when they start.
B) Students' IQ scores tend to drop during the school year as they struggle to learn a lot of additional information, and then rise during the summer when they are less stressed.
C) When children are moved from financially poor schools to more affluent schools, their IQ scores increase.
D) Children with very high intelligence scores tend to drop out of school because they get bored.