Irene bialik, a psychologist, wants to study how the habit of telling lies affects marital relationships. she contacts married couples from across the country to participate in her study. she lets them know that the only cost of participation would be that they would need to reveal if they have ever lied to their parents. irene also informs them that they will be paid an amount of $1,000 each for participating in the study. in this scenario, which guideline of psychological research best describes the one followed by irene?