What Is the Advantage of the Pretest in the Non-Equivalent

What is the advantage of the pretest in the non-equivalent control group pretest-posttest design?

A) The pretest accustoms the participants to the procedures of the study.
B) Participants who experience a pretest generally score higher on a posttest.
C) When groups are not equivalent,we can look at changes from pretest to posttest scores.
D) If the pretest scores are different,we can stop the study immediately without wasting time or money continuing the study.