A manufacturer or seller of a product may identify its merchandise and bar others from using the same identification by getting a

Afranchise.
Btrademark.
Cpatent.
Dcopyright.

Verified Answer :

A manufacturer or seller of a product may identify its merchandise and bar others from using the same identification by getting a B. TRADEMARK.

Trademarks are recognized signs or designs that are related to a specific product or service. This sign differentiates the owner from other companies. 

Examples of trademarks are brand, logo, or company or product name.