The correct answer to this question is D. Sodium fluoride is an inorganic compound that is colorless or a white solid that is soluble in water. Ethanol is a renewable fuel that is in more than 98% of the gasoline in the United States. Ethyl alcohol, or ethanol, is found in plasma, serum, and whole blood in the body.
In order to collect the ethanol, you need a tube that will maintain the sample and the compound. Sodium fluoride is a common preservative for blood samples because it has been recommended. It has been shown to not significantly alter the ethanol levels that are found in the blood.