Answer :

Let's carefully analyze the question step-by-step to determine the correct answer.

1. Understanding Proof:
The term "proof" is a measure of the strength of an alcoholic drink. Specifically:
- Proof is defined as twice the percentage of alcohol by volume (ABV) in the beverage.
- For example, a drink with an alcohol content of 40% ABV would be 80 proof.

2. Given Information:
- The drink contains 50% alcohol by volume.

3. Calculating the Proof:
- Using the definition of proof, we need to multiply the percentage of alcohol by 2.
[tex]\[ \text{Proof} = \text{Alcohol Percentage} \times 2 \][/tex]
- Plugging in the given alcohol percentage:
[tex]\[ \text{Proof} = 50\% \times 2 \][/tex]

4. Performing the Calculation:
- To complete the calculation, we simply multiply:
[tex]\[ \text{Proof} = 50 \times 2 = 100 \][/tex]

Therefore, a drink that contains 50% alcohol is considered 100 proof.

The correct answer is:
100 proof.

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