Answer:
C) product sampling
Step-by-step explanation:
Product Sampling is the technique of marketing the product, by providing a small sample of the product for free, so that the customer uses the product and satisfy themselves.
This is one of the most expensive methods of marketing the product, as distributing the product for free, would cost the company, but as this proves the quality of the product, it creates belief among the consumers and customers.
Distribution of free razors is a product sampling method.