In a clinical trial, why is it important to blind the study participants, investigators, and data analysts to treatment allocation?

Blinding prevents researchers, participants and data analysts from subconsciously influencing the study results based on their knowledge of which treatment group a participant is in

Blinding reduces bias arising from the beliefs and expectations of the researchers, participants and data analysts

Blinding helps control for the placebo effect, where participants may experience positive outcomes simply because they believe they are receiving an active treatment

All of the above