Arguments in Favor of Requiring Participants' Informed Consent for Observations

Multiple Choice

Arguments in favor of requiring participants' informed consent for observations of public behavior include(s) which of the following?

A) Although people implicitly consent to having their behavior observed, they have not consented to have their behavior recorded.
B) Observation of even public behavior is an invasion of privacy.
C) It can sometimes be difficult to decide what constitutes a public venue for observation.
D) all of the above.