Depending what is there problem what would be easier that some time.
Answer: d. double-blind
Explanation:
A double blind study can be define as the study in which both the researcher and participant do not know which participant is receiving a particular treatment. This method is useful as it prevents the bias in the results of the experiment.
The given situation is the example of double-blind study. Here, the participants as well as the researcher do not know which group of subject are receiving bacteria in the yogurt and which group is not receiving.
The first one is A, in order to avid peer pressure you have to know what peer pressure is and who has been a victim to peer pressure.
The second one is True
The third one is A to aid product marketers.
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