Answer:
The on-line research strategies that raises the most concerns regarding ethical principle of respecting the autonomy of research subjects and the corresponding federal regulations requiring informed consent are: C) and D).
Step-by-step explanation:
C) A researcher observing an open support group whithout announcing her presence is an alteration of both respecting the autonomy of the research subjets and also doesn´t consider the regulations requiring informed consent.
The subjects should know they are being subjtect of a research, to see if they agree or not. The researcher by not annouincing her is not respecting their autonomy to decide.
D) If a researcher poses to be a survivor from cancer when not, to be able to get closer to people that are; she is violating both the respecto for autonomy on the research subjects and also she is braking the informed consent.