Grace Conducted an Experiment to Study the Incidence of Birth

Multiple Choice

Grace conducted an experiment to study the incidence of birth defects in infants born of mothers who drank alcohol during their pregnancies.From the outset of the study,she had a poster located behind her desk in full view of study participants that stated,"Don't Drink" accompanied by a disturbing image of a newborn with multiple birth defects.What type of bias does this poster represent?

A) researcher
B) participant
C) demand characteristic
D) statistical