A common noun is defined as a noun describing a class of a certain object or concept. In other words, it is the general name of a person, thing, animal, idea, place or event. The sentence that contains three common nouns is option A. She has never upset an object or as much as brushed a magazine onto the floor.
I believe that making online purchases through smart speakers isn't a good idea. It would become very easy to steal credit card information if you are just yelling it into your devices. You also have the scenario were a kid or friend could jokingly order something.
