Consensus is a general agreement. So I would definitely choose C. But for the second answer. it will either be B or D
<span>D because hearsay is info received from other people that one cannot adequately substantiate... or in other words, a rumor.</span>
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.
