Answer:
Henri Tajfel's greatest contribution to psychology was social identity theory. ... The central hypothesis of social identity theory is that group members of an in-group will seek to find negative aspects of an out-group, thus enhancing their self-image.
Explanation:
C. Promoting racial equality
<span>The IRB must ensure, when designing a study, that those who are impaired are not subject to coercion or undue influence upon their responses. In addition, they are to be ensured that they are being equitably selected by the researchers, and that their capacity to consent is measured properly and that the consent itself truly is voluntary.</span>
Enslaved workers planted and harvested crops on plantations is the answer
I think that the answer is a because than they can pass laws when other can't and they can have their own rules.