Concept:Advertising is any paid form of non-personal presentation of a product by an identified sponsor.
Explanation:The key words in the definition are "paid" and "identified sponsor."
Publicity is not paid for by the sponsor and may come from news coverage.
Personal selling involves direct contact between the seller and the buyer.
Sales promotion uses short-term incentives to encourage immediate purchase.
These options do not match the given description.
Advertisement matches exactly because it is a paid presentation by an identified sponsor to promote a product.
Therefore, the correct choice is advertisement.
Answer:D. advertisement