When Comparing a Disadvantaged Group That Gets the Treatment to an Advantaged

Multiple Choice

When comparing a disadvantaged group that gets the treatment to an advantaged group that gets no-treatment, all of the following are true EXCEPT

A) Regression effects may make the treatment seem more effective than it is
B) Selection by maturation effects may make the treatment seem less effective than it is
C) The most convincing evidence for the treatment's effect is if the treatment group scores better than the no-treatment group
D) Matching will not make the groups equivalent.