Final answer:
Point of purchase ads for a product usually work best in the evaluation and trial stage of the adoption process. So, the correct answer is option c.
Step-by-step explanation:
Point of purchase ads for a product usually work best in the evaluation and trial stage of the adoption process. This is when potential customers are actively considering the product and are likely to be receptive to information that helps them make a decision. Point of purchase ads can provide important details, incentives, and promotions to encourage customers to choose the product.
So, the correct answer is option c.