By allowing consumers to sell their unwanted goods to other consumers, auction sites like ebay and etsy cater to marketing.1) b2b
2) c2c
3) d2c
4) c2d
5) b2g

By allowing consumers to sell their unwanted goods to other consumers, auction sites like eBay and Etsy cater to C2C marketing

Explanation:

Consumer markets offer a creative way to enable customers to interact. Traditional markets demand a customer relationship between businesses in which a client goes to a company to buy a product or service.

Craigslist, Etsy and EBay, which offer products or services via a listed or auction program, are part of C2C online company sites.

Examples of C2C E-Commerce

Craigslist is still one of the world's leading blogs and the leading ad provider. In addition to buying, selling and trade items, consumers are allowed to undertake other purchases such as housing and job searches.

answer; (d) i believe that the correct answer is ; /// a new invention lowers the cost of production;