Which of the following are reasons a study of child development might be unethical? Choose all that apply. The researcher uses methods that might do physical or psychological damage. Participants (or parents) did not give voluntary consent. Participants were too young to know what was happening during the study. Participants' identities were not kept confidential.
a. The researcher uses methods that might do physical or psychological damage.
b. Participants (or parents) did not give voluntary consent.
c. Participants were too young to know what was happening during the study.
d. Participants' identities were not kept confidential.