The provisions of Subpart D, of the HHS regulations, Additional Protections for Children Involved as Subjects in Research apply to:

All research involving children

All research that is more than minimal risk

All research funded by any federal agency

All research funded by HHS

The correct answer is A) "All research involving children".

The HHS (Office for Human Research Protections) is a regulatory entity of the US government. The provisions presented in subpart D of the mentioned regulations divide all research involving children in 3 categories:

Research not involving greater than the minimal risk to the children. Research involving greater than minimal risk but presenting the prospect of direct benefit to the child involved in the research. Research involving greater than minimal risk and presenting no prospect of direct benefit to the child involved in the research.