Final answer:
Sales agents provide various benefits for businesses, except for the ability to replace manufacturer's sales agents, option C.
Step-by-step explanation:
The benefits of using sales agents in a business include: possessing the same market knowledge as in-country nationals, being less expensive than full-time, in-country national sales representatives, working under contract rather than as full-time employees, and possessing the same cultural knowledge as in-country nationals.
However, one benefit that sales agents do not provide is the ability to eventually replace the manufacturer's sales agents. Manufacturer's sales agents are typically responsible for selling the company's products directly and have a deeper understanding of the products and the company's goals, making them harder to replace.