Answer:
Minimum Risk
Explanation:
When working with subjects in a research especially humans. There are set regulations that protects the public from a number of health risks.
There are agencies and one of them is the U.S. Department of Health and Human Services regulations.
According to this regulation body, minimum risk means the magnitude and probability of harm anticipate in the study are not greater than those normally encountered in daily life or during physical and psychological tests.
Since the above study by Kenneth does not pose any harm beyond the normal. It can be classified as containing minimum risk.