Answer: Fragment
Explanation: It does not contain a subject and verb and object.
"A" is probably the best choice. All of your other choices are close-ended questions, and can only be answered with a simple yes or no, But "A" is an open-ended question because the answer wont be just a "yes" or "no".
Hope this helps!
Answer:
In 1912 Claude installed the first-ever neon advertising sign in a Parisian barbershop on the Boulevard Montmartre. A large rooftop sign for the Italian vermouth maker Cinzano soon followed, along with illumination for the entrance of the Paris Opéra. Ne or neon gas is used for advertising signs, as are other noble gases. ... The gas itself has no color until an electric charge is applied that alters the structure of the Ne molecules. Neon gas only produces a reddish orange color light, so other inert gases are used to make other colors.
The answer is present tense
