Answer: Double blind clinical trial
Explanation:
The situation that is seen here is double blind clinical trail in which neither the participant nor the practitioner knows who is receiving the treatment.
This is used to prevent biasing in the experiment which is caused due to demand characteristics or placebo effect.
Here, in this situation the dog handlers and the experimental observer both were blinded to identify the breath sample.
The answer is D! Hope I helped!
because low self-esteem can lead to depression and make it hard for a person to have healthy relationships with others
Pretty sure the answer is D
