Answer:
The correct answer is - It tends to cause subjects to behave differently than they would without the pretest.
Step-by-step explanation:
In psychology, a pretest is an assessment for measuring or finding the characteristics of the participant or subject before introducing the treatment or intervention in the research or study. It is designed to have an idea about the behavior or knowledge of the subject.
The major risk of the pretest is that it leads to subjects acting or behaving differently than they would act without this pretest. This leads to errors in research as they can manipulate the study.