Double blind experiment is used in experimental setting to avoid impartial judgement or error from biases. It involves the physician and the patient not being aware of who is getting the drug. In a study where the effect of a new drug is being tested, the medical researcher interacts with those participating in the study without knowing who is getting the real drugs and those getting the placebo [the substances that look like the real drug being used but are not]
To revoke means to suspend a particular license or access such as drivers license for an indefinite period of time. Usually a court order when someone has violated a certain rule guiding such license.
So therefore the best option is option B because it has that indefinite period of time stated
From being a suggested explanation (for an observable
phenomena), hypothesis develops into a scientific theory. Hypothesis that is tested or undergone
scientific methods and experimental research
move on to become a scientific theory. Scientific theories have consistent with
experimental results and must have predictive power.
