In One Study, a Professor Gave Firm Deadlines to One

In one study, a professor gave firm deadlines to one section of his course and let students in his other section choose their own deadlines. What were the results?

A) Students did about equally well with any kind of deadline.
B) Students who had the opportunity to choose their own deadlines did better than those in the class with assigned deadlines.
C) Students who chose deadlines at the end of the semester did better than those who chose evenly spaced deadlines.
D) Students who chose deadlines evenly spaced through the semester did better than those who chose deadlines at the end.