I believe the answer is: Confounding;
Third factors
conclusion that is created by researchers usually based on the relationship between independent and dependent variables. But, confounding and third factors variables both influencing the independent and dependent variables at the same time, which often clouded the true relation between the independent and dependent variables.
To put it in detail, the ninth amendment states that there may be other rights that exist even though these are not explicitly mentioned and therefore, these should also be taken into consideration and should not be violated. On the other hand, the tenth amendment focuses on the power that is reserved for the people. Therefore, the best answer for this is option A. Hope this helps.
The answer it maybe referring to is " Napata" Napata was a city-state of ancient Nubia on the west bank of the Nile at the site of modern Karima, Sudan (hoped that this helped you )
