In a Class Where Students Got to Choose Their Own

Multiple Choice

In a class where students got to choose their own deadlines for three papers,students who chose to spread out their deadlines equally got better grades than those who chose to put all their deadlines at the end of the course.To interpret the meaning of these results,what control group do we need?​

A) Another section where students did not have to write papers
B) ​Another section where students all had to spread their deadlines out equally
C) ​Another section where students made the same choice for two papers instead of three
D) ​Another section where students wrote only one paper, due at the end of the course