Answer:
The correct option is;
Workers
Step-by-step explanation:
The Federal Policy for the Protection of Human Subjects or the “Common Rule” was published in 1991
Under the Health and Human Service regulations 45 CFR part 46 (the Federal Policy for the Protection of Human Subjects or "Common Rule" published in 1991) the principles of ethical research involving human subjects, care should be taken with regards to the specific requirements of vulnerable populations such as children, pregnant women, prisoners, mentally disabled persons, economically disadvantaged or educationally disadvantaged persons.