Detracking is a major concern for parents of high-achieving students because:
a. they believe that detracking, which involves simplifying the secondary school curricula, is unlikely to challenge their children's minds.
b. they often believe their children are losing out because lower-achieving students are in their courses.
c. they believe their children are more likely to maximize their potential if placed with less-talented students.
d. they often believe their children's high academic performance is a result of the influence of the mixed group in which they study.