What type of research does Subpart D specifically regulate?

Subpart D specifically regulates all research involving children, regardless of the funding source. This regulation is in place to ensure ethical considerations are upheld given the vulnerabilities of child participants in research studies. Children are recognized as a vulnerable population, and their rights and welfare must be specially safeguarded.

Research involving children requires additional protections due to their inability to fully comprehend the research's risks and benefits. Therefore, regulations under Subpart D focus on enhancing safeguards and requiring parental consent, as well as assent from the children themselves when appropriate.

While some of the other options allude to specific contexts or conditions of research involving children, they do not encompass the comprehensive scope of Subpart D, which applies universally to all research involving minors, ensuring that ethical practices are maintained across a wide variety of studies and settings.