Final answer:
To initiate the return process to the vendor for a defective product, you should create a return merchandise authorization (RMA) record(option B).
Step-by-step explanation:
When a customer returns a defective product and you plan to ship it back to the vendor for credit, you need to initiate the return process by creating a return merchandise authorization (RMA) record.
An RMA is a document that authorizes the return of the product to the vendor. It usually includes important details such as the reason for return, product information, and return instructions. This record helps both you and the vendor keep track of the return and ensures a smooth process.
The other options mentioned in the question, such as a return to vendor (RTV) or inventory adjustment, are not specifically tied to the return process to the vendor. An RTV may refer to a separate process for returning a product without the intention of receiving credit, while an inventory adjustment may be used to account for damaged or defective products within your own inventory.