Call the cops and scream for help
Contamination. The contaminate tourniquet can have germs or disease that would enter the blood being draw and give a wrong diagnosis.
I believe the answer is: D. They can be stored in the body.
Unlike other similar substance, Fat-soluble vitamins cannot be dissolved in water and would give the best performance when being consumed together with foods with higher fat content.
When the body do not use all the existing fat soluble vitamins, they would be stored within the liver and fatty tissue for future use.
True I guess is the answer