A is the answer. Hope that helped.
It is called blind. a condition in which the participant is not aware if he/she is in the experimental or control group
Phenotype are traits what is actually expressed
Whether or not the article describes persenal experience is the major determining factor in this question. If the article tells the story of another, it is secondary, if the article was written by someone who is recounting on their experience, it is first peron. Hope this is clear and understandable.
