The argument discusses consumers’ attitudes upon acquisition of appliances, so the extended use of these appliances is outside of the scope of the argument.

This tells us that consumers have a way to determine which exact model they’re purchasing, even if the model name isn’t informative. Consumers can just use the model number to see which product they get, so this information may even support the argument.

The argument is about customers’ objections to the practice of listing different products under the same name; having the same products with different names is not relevant to this issue.

This weakens the argument because it shows that customers could purchase an appliance without knowing if they’re getting the older version or the “improved” version. If a customer can’t know if they are getting the old or the improved version, they may have a reason to object.

This information refers to manufacturers’ motivations, while the argument discusses consumers’ reactions to manufacturers’ practices. This information is outside the scope of the argument.