Brand names are primarily used to:

To solve this question, the user needs to know the purpose of brand names.

Option A is incorrect because brand names are not used to show consumers that you own the product. Ownership is demonstrated through legal documentation and contracts, not brand names.

Option B is incorrect because although brand names can improve the image of a product, this is not their primary purpose. The primary purpose of a brand name is to identify a product and distinguish it from other products in the marketplace.

Option C is correct. The primary purpose of a brand name is to help identify a product. A brand name is a unique identifier that distinguishes a product from other products in the marketplace. Brand names can be protected by trademarks to prevent other companies from using the same name or confusing consumers.

Option D is incorrect because while brand names can help consumers select a product or service, this is not their primary purpose. The primary purpose of a brand name is to identify and distinguish a product from other products in the marketplace.

Therefore, the answer is: C. To help identify a product.