Which of the Following Best Illustrates the Experimenter Bias Effect

Multiple Choice

Which of the following best illustrates the experimenter bias effect?

A) Dr.Swanson observes that the subjects in the experimental group received a different drug than those in the control group.
B) After learning a new reading technique,Lola is able to read better.
C) Every time infant Alex smiles at a picture,Dr.Moss infers that the infant likes the picture.
D) When Alice's cat sees Alice coming,she begins to purr.