Final answer:
95% ethanol by volume is equal to 190 proof, which is calculated by doubling the alcohol percentage, making the correct answer 190 proof.
Step-by-step explanation:
The proof of an alcoholic beverage is a measure of its alcohol content. The term "proof" is used differently in the United States and some other countries. In the U.S., the proof is twice the percentage of alcohol by volume (ABV).
95% ETOH (ethanol) equates to 190 proof. The term proof is a measure of the alcohol content in a spirit or liquor. The system used in the United States defines proof as twice the percentage of alcohol by volume. Therefore, if a solution is 95% ethanol by volume, it would be 95 x 2 = 190 proof. This is Option (a) 190 proof.