The right option is; C. showing a product being used by a large group of people.
The bandwagon propaganda technique is a persuasive technique that involves persuading people to agree or act in some way because other people are doing so. An example of this technique can be a body cream product advertisement, wherein a large number of people are shown using the same body cream. People feel encouraged to buy and use that body cream as it is shown to be used by many.
