Federal regulations (45 CFR 46), subparts B, C, and D provide additional protections for certain populations in research. The following groups that are protected in the federal regulations (45 CFR 46), specifically in Subparts B, C, and D with additional protections - pregnant women, prisoners, and individuals who are economically disadvantaged. The answer is C.
Subpart B — Additional Protections for Pregnant Women, Human Fetuses and Neonates Involved in Research
Subpart C — Additional Protections Pertaining to Biomedical and Behavioural Research Involving Prisoners as Subjects
Subpart D — Additional Protections for Children Involved as Subjects in Research
