Answer:
I guess proper planning of social policies and hardwork
Answer: Option D
Explanation:
The test groups were divided into three groups the positive, negative and no feedback groups. The positive groups got better scores than compared to the negative feedback group and no feedback group.
The ethical guidelines that is violated is the inappropriate use of deception. The group that got negative feedback. Intentionally their morale was downsided.
Deception is not ethical in case of psychological experiments however, in some cases it is allowed to keep the experiment unbiased.