Which ethical guideline would a scientist be breaking if the scientist videotaped children, without asking their guardians, while the children were taking a test in class?

Privacy

Explanation:

In research, privacy is a concept that ensures that if human participants are used, they have a right to privacy when they are participating in a research. For children who may not be of age to understand the concept of privacy, their parents or guardian would be informed about the research and consent will be given. However the scientist that failed to ask the parent or guardian and videotaped children while taking a test has interfered in the privacy of these kids.