Respuesta :
It should be noted that In a double-blind experiment,Neither the subjects nor the experimenter know who is in the treatment group.
What is a double-blind experiment?
A double-blind experiment can be regarded as a type of experienment that neither the participants nor the experimenters know who is receiving a particular treatment.
Therefore, option D is correct.
Learn more about double-blind experiment at;
https://brainly.com/question/13171394