Final answer:
Merchant wholesalers are the largest group and they are classified as full-service and limited-service, differing mainly in the range of services they offer. On the other hand, limited-service wholesalers offer fewer services to their customers and operate on lower margins with greater efficiency in specific tasks.
Step-by-step explanation:
The largest group of wholesalers is C) Merchant wholesalers. These wholesalers can be categorized into two broad types: full-service and limited-service. Full-service wholesalers provide a range of services to their customers, including stocking inventory, order processing, delivery, credit, and marketing services. On the other hand, limited-service wholesalers offer fewer services to their customers and operate on lower margins with greater efficiency in specific tasks.