What is an example of transit advertising?

Transit advertising refers specifically to promotional messages that appear in or on vehicles used for public transportation, such as buses, subways, taxis, and trains, as well as in transit stations. The option that describes an ad on a public transportation bus fits this definition perfectly. This form of advertising takes advantage of high foot traffic in transit areas and increases visibility among commuters, making it an effective way to reach a large audience.

The other options, while related to advertising, fall under different categories. Online banner ads are digital advertisements that appear on websites, while advertisements in newspapers are print media. Commercials on television are broadcast media. Each of those platforms has its own unique audience and context, but only the ad on a public transportation bus is classified as transit advertising.