ANSWER: C) advertising nationally
Step-by-step explanation: The option to advertise nationally will help the brand company to reach out maximum consumers. People from different parts of the company will be able to know about the company irrespective of their income levels, geographical locations, taste and preferences. This kind of reach will not be possible with other three options. Selling at trade shows will only reach the consumers attending the show, sending mails will attract a handful of people in the small town. This is also a form of marketing selectively to few people and not attempting to reach out to the mass.