Which One of the Following Accurately Describes a Disadvantage of Specifically

Multiple Choice

Which one of the following accurately describes a disadvantage of specifically using a pretest-posttest design?

A) A pretest introduces a new confound of participant mortality.
B) If participants drop out,you no longer have equal groups.
C) A pretest can sensitize the participants to the manipulation.
D) This design does not allow you to rule out regression effects.