In the Year 2525, People Are Separated into Groups

In the year 2525, people are separated into groups. A standardized "Group A" IQ test has been developed, and results indicate that as a group, Group A people have an average IQ score that is 25 points higher than the Group B people. Which of the following statements is an incorrect conclusion?

A) Any individual Group A person is more intelligent than any individual Group B person.
B) These results may be explained by differences in the socioeconomic status between Group A and Group B people.
C) These results may be explained by motivational differences based on how much value is placed on academic achievement.
D) While genetic differences may contribute to IQ, any person may improve his or her own score if given the "right" environmental conditions.