An Intervention Hopes to Reduce Teenage Texting While Driving by Introducing

An intervention hopes to reduce teenage texting while driving by introducing an intervention in a local driver's education course.Researchers will measure the young people's self-reported propensity to text and drive before and after the intervention.What is one issue confronting the pre-post design of this study?

A) Researchers would achieve more accurate validity with reflexive controls.
B) Statistical controls might better account for pre- and post-design outcomes.
C) Young people's awareness of the dangers of texting and driving might increase throughout a driver's education course even without the intervention.
D) Because of selection bias,young people who were already aware of the dangers of texting and driving may be more likely to enroll in the study.