Which of the following is a finding of the research examining the effects of class size on educational achievement?
a. Schools with smaller class sizes do not benefit students more than schools with larger classes.
b. Students who have been in small classes are more likely to have discipline problems when they are subsequently placed in regular-sized classes.
c. Short-term and long-term benefits of smaller classrooms are stronger for minority and low-income students.
d. Class size in elementary school does not predict educational achievement as long as the classroom is composed of students of the same aptitude levels.