Correct option is A
Ethical issues in research involving human subjects generally focus on the well-being, rights, and dignity of the participants.
A. Lack of informed consent: Ethically, participants need to be fully informed about the research and consent to it voluntarily. Lack of informed consent is a major ethical issue.
B. Physical and psychological harm: Causing any form of harm to the participants is clearly unethical.
C. Excessive inducements: Offering excessive incentives could be seen as coercion, making it unethical.
Therefore, A, B, and C are ethical issues, while D is an ethical practice. Hence, the correct answer is (a) A, B and C only.
Information Booster
Debriefing: This is actually an ethical practice, not an ethical issue. It involves explaining the research to participants after it's concluded, especially if deception was used.