Concept:A retailer is the final link in the chain of distribution who sells directly to the ultimate consumer.
Explanation:Retailers buy goods from wholesalers in relatively small quantities, not in bulk.
Their defining feature is that they break bulk and sell in small, convenient amounts.
These amounts are called units, such as single tins, packets, or pieces.
Because the retailer serves the final consumer, purchases are usually made one unit at a time.
Selling in bulk or large quantities is the role of wholesalers, not retailers.
This means the nature of a retailer's sales is best described as selling in units.
Answer:C. Units