which of the following is a group of people who advertisers believe will buy a product or use a service?

Target audience.

why might and ethical consumer buy goods she knows are manufactured by unionized workers?

An ethical consumer might buy goods that are manufactured by unionized workers because they believe that supporting unionized workers is a responsible ethical decision. Unionized workers have better bargaining power and are able to negotiate for better wages, benefits, and working conditions, which leads to better livelihoods for them and their families. An ethical consumer might also support unionized workers as part of a broader effort to promote fair labor practices and address issues of social justice. Additionally, an ethical consumer may believe that supporting unionized workers helps to promote a strong and stable economy, which benefits society as a whole.

The group of people that advertisers believe will buy a product or use a service is called the target audience. Advertisers spend time and resources understanding their target audience's demographics, preferences, and behaviors to create effective marketing campaigns. To determine the target audience for a particular product or service, advertisers employ market research techniques such as surveys, focus groups, and data analysis. This information helps advertisers tailor their advertising messages and select the most appropriate channels for reaching their target audience. Ultimately, the goal is to effectively communicate the product or service's benefits and features to the people most likely to engage with it.