Concept:A disadvantage of retailing is any practice that creates extra cost or risk for the retailer.
Explanation:When a retailer sells on credit, payment is delayed.
This ties up the retailer’s capital and increases the risk of bad debts.
Lower prices of goods reduce the retailer’s profit, but this is not the main disadvantage.
Selling in smaller quantities and convenient locations are services offered by retailers.
They are considered advantages, not disadvantages.
Thus, selling on credit is the clear disadvantage among the options.
Answer:A. selling on credit