Which best explains the purpose of the ninth amendment?

The 9th Amendment asserts that the people have rights beyond those listed in the Constitution.

Further detail:

The 9th and 10th Amendments are closely related.  

The 9th Amendment asserts that the Constitution has not attempted to list all the rights that individuals have, and affirms that the people have rights that are not all listed within the Constitution.

The 10th Amendment affirms that the Constitution is the law of the United States, but that states themselves are free to establish their own constitutions and laws, as long as they are not in conflict with the US Constitution.

Here's the wording of those two amendments:

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts