Final answer:
A billboard is an example of an advertisement, as it is a paid message designed to inform or influence the people who see it.
Step-by-step explanation:
An example of an advertisement is b. A billboard. Advertisements are paid messages intended to inform or influence people who receive them, as defined by the American Marketing Association. Billboards are a classic form of outdoor advertising that carry bold visuals and catchy slogans to grab the attention of drivers and pedestrians. Company newsletters, press releases, and news articles about the company can contain promotional material but are not advertisements in themselves. Newsletters are typically intended for a specific audience already affiliated with the company, press releases are official statements for the media, and news articles are meant to provide information or report on events. While they might contribute to a brand's image, they are not paid content aiming to directly sell a product or service.